mISDN: Add HFC USB driver
authorKarsten Keil <kkeil@suse.de>
Fri, 9 Jan 2009 15:20:51 +0000 (16:20 +0100)
committerKarsten Keil <kkeil@suse.de>
Fri, 9 Jan 2009 21:44:30 +0000 (22:44 +0100)
Enable support for USB ISDN TAs with Cologne Chip AG's
HFC-S USB ISDN Controller.

Signed-off-by: Martin Bachem <m.bachem@gmx.de>
Signed-off-by: Karsten Keil <kkeil@suse.de>
drivers/isdn/hardware/mISDN/Kconfig
drivers/isdn/hardware/mISDN/Makefile
drivers/isdn/hardware/mISDN/hfcsusb.c [new file with mode: 0644]
drivers/isdn/hardware/mISDN/hfcsusb.h [new file with mode: 0644]

index 14793480c453e0e915a4188dc697af6e9e5b416e..fd112ae252cfb9d871c985df5aa88a8ddaffabf7 100644 (file)
@@ -23,3 +23,10 @@ config MISDN_HFCMULTI
           * HFC-8S (8 S/T interfaces on one chip)
           * HFC-E1 (E1 interface for 2Mbit ISDN)
 
+config MISDN_HFCUSB
+       tristate "Support for HFC-S USB based TAs"
+       depends on USB
+       help
+         Enable support for USB ISDN TAs with Cologne Chip AG's
+         HFC-S USB ISDN Controller
+
index 1e7ca5332ad7e27ed7c873eaa07347be995e6733..b0403526bbba01d25582c862613c045ab89cb584 100644 (file)
@@ -5,3 +5,4 @@
 
 obj-$(CONFIG_MISDN_HFCPCI) += hfcpci.o
 obj-$(CONFIG_MISDN_HFCMULTI) += hfcmulti.o
+obj-$(CONFIG_MISDN_HFCUSB) += hfcsusb.o
diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c
new file mode 100644 (file)
index 0000000..ba6925f
--- /dev/null
@@ -0,0 +1,2196 @@
+/* hfcsusb.c
+ * mISDN driver for Colognechip HFC-S USB chip
+ *
+ * Copyright 2001 by Peter Sprenger (sprenger@moving-bytes.de)
+ * Copyright 2008 by Martin Bachem (info@bachem-it.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * module params
+ *   debug=<n>, default=0, with n=0xHHHHGGGG
+ *      H - l1 driver flags described in hfcsusb.h
+ *      G - common mISDN debug flags described at mISDNhw.h
+ *
+ *   poll=<n>, default 128
+ *     n : burst size of PH_DATA_IND at transparent rx data
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/usb.h>
+#include <linux/mISDNhw.h>
+#include "hfcsusb.h"
+
+const char *hfcsusb_rev = "Revision: 0.3.3 (socket), 2008-11-05";
+
+static unsigned int debug;
+static int poll = DEFAULT_TRANSP_BURST_SZ;
+
+static LIST_HEAD(HFClist);
+static DEFINE_RWLOCK(HFClock);
+
+
+MODULE_AUTHOR("Martin Bachem");
+MODULE_LICENSE("GPL");
+module_param(debug, uint, S_IRUGO | S_IWUSR);
+module_param(poll, int, 0);
+
+static int hfcsusb_cnt;
+
+/* some function prototypes */
+static void hfcsusb_ph_command(struct hfcsusb *hw, u_char command);
+static void release_hw(struct hfcsusb *hw);
+static void reset_hfcsusb(struct hfcsusb *hw);
+static void setPortMode(struct hfcsusb *hw);
+static void hfcsusb_start_endpoint(struct hfcsusb *hw, int channel);
+static void hfcsusb_stop_endpoint(struct hfcsusb *hw, int channel);
+static int  hfcsusb_setup_bch(struct bchannel *bch, int protocol);
+static void deactivate_bchannel(struct bchannel *bch);
+static void hfcsusb_ph_info(struct hfcsusb *hw);
+
+/* start next background transfer for control channel */
+static void
+ctrl_start_transfer(struct hfcsusb *hw)
+{
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s\n", hw->name, __func__);
+
+       if (hw->ctrl_cnt) {
+               hw->ctrl_urb->pipe = hw->ctrl_out_pipe;
+               hw->ctrl_urb->setup_packet = (u_char *)&hw->ctrl_write;
+               hw->ctrl_urb->transfer_buffer = NULL;
+               hw->ctrl_urb->transfer_buffer_length = 0;
+               hw->ctrl_write.wIndex =
+                   cpu_to_le16(hw->ctrl_buff[hw->ctrl_out_idx].hfcs_reg);
+               hw->ctrl_write.wValue =
+                   cpu_to_le16(hw->ctrl_buff[hw->ctrl_out_idx].reg_val);
+
+               usb_submit_urb(hw->ctrl_urb, GFP_ATOMIC);
+       }
+}
+
+/*
+ * queue a control transfer request to write HFC-S USB
+ * chip register using CTRL resuest queue
+ */
+static int write_reg(struct hfcsusb *hw, __u8 reg, __u8 val)
+{
+       struct ctrl_buf *buf;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s reg(0x%02x) val(0x%02x)\n",
+                       hw->name, __func__, reg, val);
+
+       spin_lock(&hw->ctrl_lock);
+       if (hw->ctrl_cnt >= HFC_CTRL_BUFSIZE)
+               return 1;
+       buf = &hw->ctrl_buff[hw->ctrl_in_idx];
+       buf->hfcs_reg = reg;
+       buf->reg_val = val;
+       if (++hw->ctrl_in_idx >= HFC_CTRL_BUFSIZE)
+               hw->ctrl_in_idx = 0;
+       if (++hw->ctrl_cnt == 1)
+               ctrl_start_transfer(hw);
+       spin_unlock(&hw->ctrl_lock);
+
+       return 0;
+}
+
+/* control completion routine handling background control cmds */
+static void
+ctrl_complete(struct urb *urb)
+{
+       struct hfcsusb *hw = (struct hfcsusb *) urb->context;
+       struct ctrl_buf *buf;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s\n", hw->name, __func__);
+
+       urb->dev = hw->dev;
+       if (hw->ctrl_cnt) {
+               buf = &hw->ctrl_buff[hw->ctrl_out_idx];
+               hw->ctrl_cnt--; /* decrement actual count */
+               if (++hw->ctrl_out_idx >= HFC_CTRL_BUFSIZE)
+                       hw->ctrl_out_idx = 0;   /* pointer wrap */
+
+               ctrl_start_transfer(hw); /* start next transfer */
+       }
+}
+
+/* handle LED bits   */
+static void
+set_led_bit(struct hfcsusb *hw, signed short led_bits, int set_on)
+{
+       if (set_on) {
+               if (led_bits < 0)
+                       hw->led_state &= ~abs(led_bits);
+               else
+                       hw->led_state |= led_bits;
+       } else {
+               if (led_bits < 0)
+                       hw->led_state |= abs(led_bits);
+               else
+                       hw->led_state &= ~led_bits;
+       }
+}
+
+/* handle LED requests  */
+static void
+handle_led(struct hfcsusb *hw, int event)
+{
+       struct hfcsusb_vdata *driver_info = (struct hfcsusb_vdata *)
+               hfcsusb_idtab[hw->vend_idx].driver_info;
+       __u8 tmpled;
+
+       if (driver_info->led_scheme == LED_OFF)
+               return;
+       tmpled = hw->led_state;
+
+       switch (event) {
+       case LED_POWER_ON:
+               set_led_bit(hw, driver_info->led_bits[0], 1);
+               set_led_bit(hw, driver_info->led_bits[1], 0);
+               set_led_bit(hw, driver_info->led_bits[2], 0);
+               set_led_bit(hw, driver_info->led_bits[3], 0);
+               break;
+       case LED_POWER_OFF:
+               set_led_bit(hw, driver_info->led_bits[0], 0);
+               set_led_bit(hw, driver_info->led_bits[1], 0);
+               set_led_bit(hw, driver_info->led_bits[2], 0);
+               set_led_bit(hw, driver_info->led_bits[3], 0);
+               break;
+       case LED_S0_ON:
+               set_led_bit(hw, driver_info->led_bits[1], 1);
+               break;
+       case LED_S0_OFF:
+               set_led_bit(hw, driver_info->led_bits[1], 0);
+               break;
+       case LED_B1_ON:
+               set_led_bit(hw, driver_info->led_bits[2], 1);
+               break;
+       case LED_B1_OFF:
+               set_led_bit(hw, driver_info->led_bits[2], 0);
+               break;
+       case LED_B2_ON:
+               set_led_bit(hw, driver_info->led_bits[3], 1);
+               break;
+       case LED_B2_OFF:
+               set_led_bit(hw, driver_info->led_bits[3], 0);
+               break;
+       }
+
+       if (hw->led_state != tmpled) {
+               if (debug & DBG_HFC_CALL_TRACE)
+                       printk(KERN_DEBUG "%s: %s reg(0x%02x) val(x%02x)\n",
+                           hw->name, __func__,
+                           HFCUSB_P_DATA, hw->led_state);
+
+               write_reg(hw, HFCUSB_P_DATA, hw->led_state);
+       }
+}
+
+/*
+ * Layer2 -> Layer 1 Bchannel data
+ */
+static int
+hfcusb_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
+{
+       struct bchannel         *bch = container_of(ch, struct bchannel, ch);
+       struct hfcsusb          *hw = bch->hw;
+       int                     ret = -EINVAL;
+       struct mISDNhead        *hh = mISDN_HEAD_P(skb);
+       u_long                  flags;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s\n", hw->name, __func__);
+
+       switch (hh->prim) {
+       case PH_DATA_REQ:
+               spin_lock_irqsave(&hw->lock, flags);
+               ret = bchannel_senddata(bch, skb);
+               spin_unlock_irqrestore(&hw->lock, flags);
+               if (debug & DBG_HFC_CALL_TRACE)
+                       printk(KERN_DEBUG "%s: %s PH_DATA_REQ ret(%i)\n",
+                               hw->name, __func__, ret);
+               if (ret > 0) {
+                       /*
+                        * other l1 drivers don't send early confirms on
+                        * transp data, but hfcsusb does because tx_next
+                        * skb is needed in tx_iso_complete()
+                        */
+                       queue_ch_frame(ch, PH_DATA_CNF, hh->id, NULL);
+                       ret = 0;
+               }
+               return ret;
+       case PH_ACTIVATE_REQ:
+               if (!test_and_set_bit(FLG_ACTIVE, &bch->Flags)) {
+                       hfcsusb_start_endpoint(hw, bch->nr);
+                       ret = hfcsusb_setup_bch(bch, ch->protocol);
+               } else
+                       ret = 0;
+               if (!ret)
+                       _queue_data(ch, PH_ACTIVATE_IND, MISDN_ID_ANY,
+                               0, NULL, GFP_KERNEL);
+               break;
+       case PH_DEACTIVATE_REQ:
+               deactivate_bchannel(bch);
+               _queue_data(ch, PH_DEACTIVATE_IND, MISDN_ID_ANY,
+                       0, NULL, GFP_KERNEL);
+               ret = 0;
+               break;
+       }
+       if (!ret)
+               dev_kfree_skb(skb);
+       return ret;
+}
+
+/*
+ * send full D/B channel status information
+ * as MPH_INFORMATION_IND
+ */
+static void
+hfcsusb_ph_info(struct hfcsusb *hw)
+{
+       struct ph_info *phi;
+       struct dchannel *dch = &hw->dch;
+       int i;
+
+       phi = kzalloc(sizeof(struct ph_info) +
+               dch->dev.nrbchan * sizeof(struct ph_info_ch), GFP_ATOMIC);
+       phi->dch.ch.protocol = hw->protocol;
+       phi->dch.ch.Flags = dch->Flags;
+       phi->dch.state = dch->state;
+       phi->dch.num_bch = dch->dev.nrbchan;
+       for (i = 0; i < dch->dev.nrbchan; i++) {
+               phi->bch[i].protocol = hw->bch[i].ch.protocol;
+               phi->bch[i].Flags = hw->bch[i].Flags;
+       }
+       _queue_data(&dch->dev.D, MPH_INFORMATION_IND, MISDN_ID_ANY,
+               sizeof(struct ph_info_dch) + dch->dev.nrbchan *
+               sizeof(struct ph_info_ch), phi, GFP_ATOMIC);
+}
+
+/*
+ * Layer2 -> Layer 1 Dchannel data
+ */
+static int
+hfcusb_l2l1D(struct mISDNchannel *ch, struct sk_buff *skb)
+{
+       struct mISDNdevice      *dev = container_of(ch, struct mISDNdevice, D);
+       struct dchannel         *dch = container_of(dev, struct dchannel, dev);
+       struct mISDNhead        *hh = mISDN_HEAD_P(skb);
+       struct hfcsusb          *hw = dch->hw;
+       int                     ret = -EINVAL;
+       u_long                  flags;
+
+       switch (hh->prim) {
+       case PH_DATA_REQ:
+               if (debug & DBG_HFC_CALL_TRACE)
+                       printk(KERN_DEBUG "%s: %s: PH_DATA_REQ\n",
+                               hw->name, __func__);
+
+               spin_lock_irqsave(&hw->lock, flags);
+               ret = dchannel_senddata(dch, skb);
+               spin_unlock_irqrestore(&hw->lock, flags);
+               if (ret > 0) {
+                       ret = 0;
+                       queue_ch_frame(ch, PH_DATA_CNF, hh->id, NULL);
+               }
+               break;
+
+       case PH_ACTIVATE_REQ:
+               if (debug & DBG_HFC_CALL_TRACE)
+                       printk(KERN_DEBUG "%s: %s: PH_ACTIVATE_REQ %s\n",
+                               hw->name, __func__,
+                               (hw->protocol == ISDN_P_NT_S0) ? "NT" : "TE");
+
+               if (hw->protocol == ISDN_P_NT_S0) {
+                       ret = 0;
+                       if (test_bit(FLG_ACTIVE, &dch->Flags)) {
+                               _queue_data(&dch->dev.D,
+                                       PH_ACTIVATE_IND, MISDN_ID_ANY, 0,
+                                       NULL, GFP_ATOMIC);
+                       } else {
+                               hfcsusb_ph_command(hw,
+                                       HFC_L1_ACTIVATE_NT);
+                               test_and_set_bit(FLG_L2_ACTIVATED,
+                                       &dch->Flags);
+                       }
+               } else {
+                       hfcsusb_ph_command(hw, HFC_L1_ACTIVATE_TE);
+                       ret = l1_event(dch->l1, hh->prim);
+               }
+               break;
+
+       case PH_DEACTIVATE_REQ:
+               if (debug & DBG_HFC_CALL_TRACE)
+                       printk(KERN_DEBUG "%s: %s: PH_DEACTIVATE_REQ\n",
+                               hw->name, __func__);
+               test_and_clear_bit(FLG_L2_ACTIVATED, &dch->Flags);
+
+               if (hw->protocol == ISDN_P_NT_S0) {
+                       hfcsusb_ph_command(hw, HFC_L1_DEACTIVATE_NT);
+                       spin_lock_irqsave(&hw->lock, flags);
+                       skb_queue_purge(&dch->squeue);
+                       if (dch->tx_skb) {
+                               dev_kfree_skb(dch->tx_skb);
+                               dch->tx_skb = NULL;
+                       }
+                       dch->tx_idx = 0;
+                       if (dch->rx_skb) {
+                               dev_kfree_skb(dch->rx_skb);
+                               dch->rx_skb = NULL;
+                       }
+                       test_and_clear_bit(FLG_TX_BUSY, &dch->Flags);
+                       spin_unlock_irqrestore(&hw->lock, flags);
+#ifdef FIXME
+                       if (test_and_clear_bit(FLG_L1_BUSY, &dch->Flags))
+                               dchannel_sched_event(&hc->dch, D_CLEARBUSY);
+#endif
+                       ret = 0;
+               } else
+                       ret = l1_event(dch->l1, hh->prim);
+               break;
+       case MPH_INFORMATION_REQ:
+               hfcsusb_ph_info(hw);
+               ret = 0;
+               break;
+       }
+
+       return ret;
+}
+
+/*
+ * Layer 1 callback function
+ */
+static int
+hfc_l1callback(struct dchannel *dch, u_int cmd)
+{
+       struct hfcsusb *hw = dch->hw;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s cmd 0x%x\n",
+                       hw->name, __func__, cmd);
+
+       switch (cmd) {
+       case INFO3_P8:
+       case INFO3_P10:
+       case HW_RESET_REQ:
+       case HW_POWERUP_REQ:
+               break;
+
+       case HW_DEACT_REQ:
+               skb_queue_purge(&dch->squeue);
+               if (dch->tx_skb) {
+                       dev_kfree_skb(dch->tx_skb);
+                       dch->tx_skb = NULL;
+               }
+               dch->tx_idx = 0;
+               if (dch->rx_skb) {
+                       dev_kfree_skb(dch->rx_skb);
+                       dch->rx_skb = NULL;
+               }
+               test_and_clear_bit(FLG_TX_BUSY, &dch->Flags);
+               break;
+       case PH_ACTIVATE_IND:
+               test_and_set_bit(FLG_ACTIVE, &dch->Flags);
+               _queue_data(&dch->dev.D, cmd, MISDN_ID_ANY, 0, NULL,
+                       GFP_ATOMIC);
+               break;
+       case PH_DEACTIVATE_IND:
+               test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
+               _queue_data(&dch->dev.D, cmd, MISDN_ID_ANY, 0, NULL,
+                       GFP_ATOMIC);
+               break;
+       default:
+               if (dch->debug & DEBUG_HW)
+                       printk(KERN_DEBUG "%s: %s: unknown cmd %x\n",
+                       hw->name, __func__, cmd);
+               return -1;
+       }
+       hfcsusb_ph_info(hw);
+       return 0;
+}
+
+static int
+open_dchannel(struct hfcsusb *hw, struct mISDNchannel *ch,
+    struct channel_req *rq)
+{
+       int err = 0;
+
+       if (debug & DEBUG_HW_OPEN)
+               printk(KERN_DEBUG "%s: %s: dev(%d) open addr(%i) from %p\n",
+                   hw->name, __func__, hw->dch.dev.id, rq->adr.channel,
+                   __builtin_return_address(0));
+       if (rq->protocol == ISDN_P_NONE)
+               return -EINVAL;
+
+       test_and_clear_bit(FLG_ACTIVE, &hw->dch.Flags);
+       test_and_clear_bit(FLG_ACTIVE, &hw->ech.Flags);
+       hfcsusb_start_endpoint(hw, HFC_CHAN_D);
+
+       /* E-Channel logging */
+       if (rq->adr.channel == 1) {
+               if (hw->fifos[HFCUSB_PCM_RX].pipe) {
+                       hfcsusb_start_endpoint(hw, HFC_CHAN_E);
+                       set_bit(FLG_ACTIVE, &hw->ech.Flags);
+                       _queue_data(&hw->ech.dev.D, PH_ACTIVATE_IND,
+                                    MISDN_ID_ANY, 0, NULL, GFP_ATOMIC);
+               } else
+                       return -EINVAL;
+       }
+
+       if (!hw->initdone) {
+               hw->protocol = rq->protocol;
+               if (rq->protocol == ISDN_P_TE_S0) {
+                       err = create_l1(&hw->dch, hfc_l1callback);
+                       if (err)
+                               return err;
+               }
+               setPortMode(hw);
+               ch->protocol = rq->protocol;
+               hw->initdone = 1;
+       } else {
+               if (rq->protocol != ch->protocol)
+                       return -EPROTONOSUPPORT;
+       }
+
+       if (((ch->protocol == ISDN_P_NT_S0) && (hw->dch.state == 3)) ||
+           ((ch->protocol == ISDN_P_TE_S0) && (hw->dch.state == 7)))
+               _queue_data(ch, PH_ACTIVATE_IND, MISDN_ID_ANY,
+                   0, NULL, GFP_KERNEL);
+       rq->ch = ch;
+       if (!try_module_get(THIS_MODULE))
+               printk(KERN_WARNING "%s: %s: cannot get module\n",
+                   hw->name, __func__);
+       return 0;
+}
+
+static int
+open_bchannel(struct hfcsusb *hw, struct channel_req *rq)
+{
+       struct bchannel         *bch;
+
+       if (rq->adr.channel > 2)
+               return -EINVAL;
+       if (rq->protocol == ISDN_P_NONE)
+               return -EINVAL;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s B%i\n",
+                       hw->name, __func__, rq->adr.channel);
+
+       bch = &hw->bch[rq->adr.channel - 1];
+       if (test_and_set_bit(FLG_OPEN, &bch->Flags))
+               return -EBUSY; /* b-channel can be only open once */
+       test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
+       bch->ch.protocol = rq->protocol;
+       rq->ch = &bch->ch;
+
+       /* start USB endpoint for bchannel */
+       if (rq->adr.channel  == 1)
+               hfcsusb_start_endpoint(hw, HFC_CHAN_B1);
+       else
+               hfcsusb_start_endpoint(hw, HFC_CHAN_B2);
+
+       if (!try_module_get(THIS_MODULE))
+               printk(KERN_WARNING "%s: %s:cannot get module\n",
+                   hw->name, __func__);
+       return 0;
+}
+
+static int
+channel_ctrl(struct hfcsusb *hw, struct mISDN_ctrl_req *cq)
+{
+       int ret = 0;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s op(0x%x) channel(0x%x)\n",
+                   hw->name, __func__, (cq->op), (cq->channel));
+
+       switch (cq->op) {
+       case MISDN_CTRL_GETOP:
+               cq->op = MISDN_CTRL_LOOP | MISDN_CTRL_CONNECT |
+                        MISDN_CTRL_DISCONNECT;
+               break;
+       default:
+               printk(KERN_WARNING "%s: %s: unknown Op %x\n",
+                       hw->name, __func__, cq->op);
+               ret = -EINVAL;
+               break;
+       }
+       return ret;
+}
+
+/*
+ * device control function
+ */
+static int
+hfc_dctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
+{
+       struct mISDNdevice      *dev = container_of(ch, struct mISDNdevice, D);
+       struct dchannel         *dch = container_of(dev, struct dchannel, dev);
+       struct hfcsusb          *hw = dch->hw;
+       struct channel_req      *rq;
+       int                     err = 0;
+
+       if (dch->debug & DEBUG_HW)
+               printk(KERN_DEBUG "%s: %s: cmd:%x %p\n",
+                   hw->name, __func__, cmd, arg);
+       switch (cmd) {
+       case OPEN_CHANNEL:
+               rq = arg;
+               if ((rq->protocol == ISDN_P_TE_S0) ||
+                   (rq->protocol == ISDN_P_NT_S0))
+                       err = open_dchannel(hw, ch, rq);
+               else
+                       err = open_bchannel(hw, rq);
+               if (!err)
+                       hw->open++;
+               break;
+       case CLOSE_CHANNEL:
+               hw->open--;
+               if (debug & DEBUG_HW_OPEN)
+                       printk(KERN_DEBUG
+                               "%s: %s: dev(%d) close from %p (open %d)\n",
+                               hw->name, __func__, hw->dch.dev.id,
+                               __builtin_return_address(0), hw->open);
+               if (!hw->open) {
+                       hfcsusb_stop_endpoint(hw, HFC_CHAN_D);
+                       if (hw->fifos[HFCUSB_PCM_RX].pipe)
+                               hfcsusb_stop_endpoint(hw, HFC_CHAN_E);
+                       handle_led(hw, LED_POWER_ON);
+               }
+               module_put(THIS_MODULE);
+               break;
+       case CONTROL_CHANNEL:
+               err = channel_ctrl(hw, arg);
+               break;
+       default:
+               if (dch->debug & DEBUG_HW)
+                       printk(KERN_DEBUG "%s: %s: unknown command %x\n",
+                               hw->name, __func__, cmd);
+               return -EINVAL;
+       }
+       return err;
+}
+
+/*
+ * S0 TE state change event handler
+ */
+static void
+ph_state_te(struct dchannel *dch)
+{
+       struct hfcsusb *hw = dch->hw;
+
+       if (debug & DEBUG_HW) {
+               if (dch->state <= HFC_MAX_TE_LAYER1_STATE)
+                       printk(KERN_DEBUG "%s: %s: %s\n", hw->name, __func__,
+                           HFC_TE_LAYER1_STATES[dch->state]);
+               else
+                       printk(KERN_DEBUG "%s: %s: TE F%d\n",
+                           hw->name, __func__, dch->state);
+       }
+
+       switch (dch->state) {
+       case 0:
+               l1_event(dch->l1, HW_RESET_IND);
+               break;
+       case 3:
+               l1_event(dch->l1, HW_DEACT_IND);
+               break;
+       case 5:
+       case 8:
+               l1_event(dch->l1, ANYSIGNAL);
+               break;
+       case 6:
+               l1_event(dch->l1, INFO2);
+               break;
+       case 7:
+               l1_event(dch->l1, INFO4_P8);
+               break;
+       }
+       if (dch->state == 7)
+               handle_led(hw, LED_S0_ON);
+       else
+               handle_led(hw, LED_S0_OFF);
+}
+
+/*
+ * S0 NT state change event handler
+ */
+static void
+ph_state_nt(struct dchannel *dch)
+{
+       struct hfcsusb *hw = dch->hw;
+
+       if (debug & DEBUG_HW) {
+               if (dch->state <= HFC_MAX_NT_LAYER1_STATE)
+                       printk(KERN_DEBUG "%s: %s: %s\n",
+                           hw->name, __func__,
+                           HFC_NT_LAYER1_STATES[dch->state]);
+
+               else
+                       printk(KERN_INFO DRIVER_NAME "%s: %s: NT G%d\n",
+                           hw->name, __func__, dch->state);
+       }
+
+       switch (dch->state) {
+       case (1):
+               test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
+               test_and_clear_bit(FLG_L2_ACTIVATED, &dch->Flags);
+               hw->nt_timer = 0;
+               hw->timers &= ~NT_ACTIVATION_TIMER;
+               handle_led(hw, LED_S0_OFF);
+               break;
+
+       case (2):
+               if (hw->nt_timer < 0) {
+                       hw->nt_timer = 0;
+                       hw->timers &= ~NT_ACTIVATION_TIMER;
+                       hfcsusb_ph_command(dch->hw, HFC_L1_DEACTIVATE_NT);
+               } else {
+                       hw->timers |= NT_ACTIVATION_TIMER;
+                       hw->nt_timer = NT_T1_COUNT;
+                       /* allow G2 -> G3 transition */
+                       write_reg(hw, HFCUSB_STATES, 2 | HFCUSB_NT_G2_G3);
+               }
+               break;
+       case (3):
+               hw->nt_timer = 0;
+               hw->timers &= ~NT_ACTIVATION_TIMER;
+               test_and_set_bit(FLG_ACTIVE, &dch->Flags);
+               _queue_data(&dch->dev.D, PH_ACTIVATE_IND,
+                       MISDN_ID_ANY, 0, NULL, GFP_ATOMIC);
+               handle_led(hw, LED_S0_ON);
+               break;
+       case (4):
+               hw->nt_timer = 0;
+               hw->timers &= ~NT_ACTIVATION_TIMER;
+               break;
+       default:
+               break;
+       }
+       hfcsusb_ph_info(hw);
+}
+
+static void
+ph_state(struct dchannel *dch)
+{
+       struct hfcsusb *hw = dch->hw;
+
+       if (hw->protocol == ISDN_P_NT_S0)
+               ph_state_nt(dch);
+       else if (hw->protocol == ISDN_P_TE_S0)
+               ph_state_te(dch);
+}
+
+/*
+ * disable/enable BChannel for desired protocoll
+ */
+static int
+hfcsusb_setup_bch(struct bchannel *bch, int protocol)
+{
+       struct hfcsusb *hw = bch->hw;
+       __u8 conhdlc, sctrl, sctrl_r;
+
+       if (debug & DEBUG_HW)
+               printk(KERN_DEBUG "%s: %s: protocol %x-->%x B%d\n",
+                   hw->name, __func__, bch->state, protocol,
+                   bch->nr);
+
+       /* setup val for CON_HDLC */
+       conhdlc = 0;
+       if (protocol > ISDN_P_NONE)
+               conhdlc = 8;    /* enable FIFO */
+
+       switch (protocol) {
+       case (-1):      /* used for init */
+               bch->state = -1;
+               /* fall trough */
+       case (ISDN_P_NONE):
+               if (bch->state == ISDN_P_NONE)
+                       return 0; /* already in idle state */
+               bch->state = ISDN_P_NONE;
+               clear_bit(FLG_HDLC, &bch->Flags);
+               clear_bit(FLG_TRANSPARENT, &bch->Flags);
+               break;
+       case (ISDN_P_B_RAW):
+               conhdlc |= 2;
+               bch->state = protocol;
+               set_bit(FLG_TRANSPARENT, &bch->Flags);
+               break;
+       case (ISDN_P_B_HDLC):
+               bch->state = protocol;
+               set_bit(FLG_HDLC, &bch->Flags);
+               break;
+       default:
+               if (debug & DEBUG_HW)
+                       printk(KERN_DEBUG "%s: %s: prot not known %x\n",
+                               hw->name, __func__, protocol);
+               return -ENOPROTOOPT;
+       }
+
+       if (protocol >= ISDN_P_NONE) {
+               write_reg(hw, HFCUSB_FIFO, (bch->nr == 1) ? 0 : 2);
+               write_reg(hw, HFCUSB_CON_HDLC, conhdlc);
+               write_reg(hw, HFCUSB_INC_RES_F, 2);
+               write_reg(hw, HFCUSB_FIFO, (bch->nr == 1) ? 1 : 3);
+               write_reg(hw, HFCUSB_CON_HDLC, conhdlc);
+               write_reg(hw, HFCUSB_INC_RES_F, 2);
+
+               sctrl = 0x40 + ((hw->protocol == ISDN_P_TE_S0) ? 0x00 : 0x04);
+               sctrl_r = 0x0;
+               if (test_bit(FLG_ACTIVE, &hw->bch[0].Flags)) {
+                       sctrl |= 1;
+                       sctrl_r |= 1;
+               }
+               if (test_bit(FLG_ACTIVE, &hw->bch[1].Flags)) {
+                       sctrl |= 2;
+                       sctrl_r |= 2;
+               }
+               write_reg(hw, HFCUSB_SCTRL, sctrl);
+               write_reg(hw, HFCUSB_SCTRL_R, sctrl_r);
+
+               if (protocol > ISDN_P_NONE)
+                       handle_led(hw, (bch->nr == 1) ? LED_B1_ON : LED_B2_ON);
+               else
+                       handle_led(hw, (bch->nr == 1) ? LED_B1_OFF :
+                               LED_B2_OFF);
+       }
+       hfcsusb_ph_info(hw);
+       return 0;
+}
+
+static void
+hfcsusb_ph_command(struct hfcsusb *hw, u_char command)
+{
+       if (debug & DEBUG_HW)
+               printk(KERN_DEBUG "%s: %s: %x\n",
+                  hw->name, __func__, command);
+
+       switch (command) {
+       case HFC_L1_ACTIVATE_TE:
+               /* force sending sending INFO1 */
+               write_reg(hw, HFCUSB_STATES, 0x14);
+               /* start l1 activation */
+               write_reg(hw, HFCUSB_STATES, 0x04);
+               break;
+
+       case HFC_L1_FORCE_DEACTIVATE_TE:
+               write_reg(hw, HFCUSB_STATES, 0x10);
+               write_reg(hw, HFCUSB_STATES, 0x03);
+               break;
+
+       case HFC_L1_ACTIVATE_NT:
+               if (hw->dch.state == 3)
+                       _queue_data(&hw->dch.dev.D, PH_ACTIVATE_IND,
+                               MISDN_ID_ANY, 0, NULL, GFP_ATOMIC);
+               else
+                       write_reg(hw, HFCUSB_STATES, HFCUSB_ACTIVATE |
+                               HFCUSB_DO_ACTION | HFCUSB_NT_G2_G3);
+               break;
+
+       case HFC_L1_DEACTIVATE_NT:
+               write_reg(hw, HFCUSB_STATES,
+                       HFCUSB_DO_ACTION);
+               break;
+       }
+}
+
+/*
+ * Layer 1 B-channel hardware access
+ */
+static int
+channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
+{
+       int     ret = 0;
+
+       switch (cq->op) {
+       case MISDN_CTRL_GETOP:
+               cq->op = MISDN_CTRL_FILL_EMPTY;
+               break;
+       case MISDN_CTRL_FILL_EMPTY: /* fill fifo, if empty */
+               test_and_set_bit(FLG_FILLEMPTY, &bch->Flags);
+               if (debug & DEBUG_HW_OPEN)
+                       printk(KERN_DEBUG "%s: FILL_EMPTY request (nr=%d "
+                               "off=%d)\n", __func__, bch->nr, !!cq->p1);
+               break;
+       default:
+               printk(KERN_WARNING "%s: unknown Op %x\n", __func__, cq->op);
+               ret = -EINVAL;
+               break;
+       }
+       return ret;
+}
+
+/* collect data from incoming interrupt or isochron USB data */
+static void
+hfcsusb_rx_frame(struct usb_fifo *fifo, __u8 *data, unsigned int len,
+       int finish)
+{
+       struct hfcsusb  *hw = fifo->hw;
+       struct sk_buff  *rx_skb = NULL;
+       int             maxlen = 0;
+       int             fifon = fifo->fifonum;
+       int             i;
+       int             hdlc = 0;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s: fifo(%i) len(%i) "
+                   "dch(%p) bch(%p) ech(%p)\n",
+                   hw->name, __func__, fifon, len,
+                   fifo->dch, fifo->bch, fifo->ech);
+
+       if (!len)
+               return;
+
+       if ((!!fifo->dch + !!fifo->bch + !!fifo->ech) != 1) {
+               printk(KERN_DEBUG "%s: %s: undefined channel\n",
+                      hw->name, __func__);
+               return;
+       }
+
+       spin_lock(&hw->lock);
+       if (fifo->dch) {
+               rx_skb = fifo->dch->rx_skb;
+               maxlen = fifo->dch->maxlen;
+               hdlc = 1;
+       }
+       if (fifo->bch) {
+               rx_skb = fifo->bch->rx_skb;
+               maxlen = fifo->bch->maxlen;
+               hdlc = test_bit(FLG_HDLC, &fifo->bch->Flags);
+       }
+       if (fifo->ech) {
+               rx_skb = fifo->ech->rx_skb;
+               maxlen = fifo->ech->maxlen;
+               hdlc = 1;
+       }
+
+       if (!rx_skb) {
+               rx_skb = mI_alloc_skb(maxlen, GFP_ATOMIC);
+               if (rx_skb) {
+                       if (fifo->dch)
+                               fifo->dch->rx_skb = rx_skb;
+                       if (fifo->bch)
+                               fifo->bch->rx_skb = rx_skb;
+                       if (fifo->ech)
+                               fifo->ech->rx_skb = rx_skb;
+                       skb_trim(rx_skb, 0);
+               } else {
+                       printk(KERN_DEBUG "%s: %s: No mem for rx_skb\n",
+                           hw->name, __func__);
+                       spin_unlock(&hw->lock);
+                       return;
+               }
+       }
+
+       if (fifo->dch || fifo->ech) {
+               /* D/E-Channel SKB range check */
+               if ((rx_skb->len + len) >= MAX_DFRAME_LEN_L1) {
+                       printk(KERN_DEBUG "%s: %s: sbk mem exceeded "
+                           "for fifo(%d) HFCUSB_D_RX\n",
+                           hw->name, __func__, fifon);
+                       skb_trim(rx_skb, 0);
+                       spin_unlock(&hw->lock);
+                       return;
+               }
+       } else if (fifo->bch) {
+               /* B-Channel SKB range check */
+               if ((rx_skb->len + len) >= (MAX_BCH_SIZE + 3)) {
+                       printk(KERN_DEBUG "%s: %s: sbk mem exceeded "
+                           "for fifo(%d) HFCUSB_B_RX\n",
+                           hw->name, __func__, fifon);
+                       skb_trim(rx_skb, 0);
+                       spin_unlock(&hw->lock);
+                       return;
+               }
+       }
+
+       memcpy(skb_put(rx_skb, len), data, len);
+
+       if (hdlc) {
+               /* we have a complete hdlc packet */
+               if (finish) {
+                       if ((rx_skb->len > 3) &&
+                          (!(rx_skb->data[rx_skb->len - 1]))) {
+                               if (debug & DBG_HFC_FIFO_VERBOSE) {
+                                       printk(KERN_DEBUG "%s: %s: fifon(%i)"
+                                           " new RX len(%i): ",
+                                           hw->name, __func__, fifon,
+                                           rx_skb->len);
+                                       i = 0;
+                                       while (i < rx_skb->len)
+                                               printk("%02x ",
+                                                   rx_skb->data[i++]);
+                                       printk("\n");
+                               }
+
+                               /* remove CRC & status */
+                               skb_trim(rx_skb, rx_skb->len - 3);
+
+                               if (fifo->dch)
+                                       recv_Dchannel(fifo->dch);
+                               if (fifo->bch)
+                                       recv_Bchannel(fifo->bch);
+                               if (fifo->ech)
+                                       recv_Echannel(fifo->ech,
+                                                    &hw->dch);
+                       } else {
+                               if (debug & DBG_HFC_FIFO_VERBOSE) {
+                                       printk(KERN_DEBUG
+                                           "%s: CRC or minlen ERROR fifon(%i) "
+                                           "RX len(%i): ",
+                                           hw->name, fifon, rx_skb->len);
+                                       i = 0;
+                                       while (i < rx_skb->len)
+                                               printk("%02x ",
+                                                   rx_skb->data[i++]);
+                                       printk("\n");
+                               }
+                               skb_trim(rx_skb, 0);
+                       }
+               }
+       } else {
+               /* deliver transparent data to layer2 */
+               if (rx_skb->len >= poll)
+                       recv_Bchannel(fifo->bch);
+       }
+       spin_unlock(&hw->lock);
+}
+
+void
+fill_isoc_urb(struct urb *urb, struct usb_device *dev, unsigned int pipe,
+             void *buf, int num_packets, int packet_size, int interval,
+             usb_complete_t complete, void *context)
+{
+       int k;
+
+       usb_fill_bulk_urb(urb, dev, pipe, buf, packet_size * num_packets,
+           complete, context);
+
+       urb->number_of_packets = num_packets;
+       urb->transfer_flags = URB_ISO_ASAP;
+       urb->actual_length = 0;
+       urb->interval = interval;
+
+       for (k = 0; k < num_packets; k++) {
+               urb->iso_frame_desc[k].offset = packet_size * k;
+               urb->iso_frame_desc[k].length = packet_size;
+               urb->iso_frame_desc[k].actual_length = 0;
+       }
+}
+
+/* receive completion routine for all ISO tx fifos   */
+static void
+rx_iso_complete(struct urb *urb)
+{
+       struct iso_urb *context_iso_urb = (struct iso_urb *) urb->context;
+       struct usb_fifo *fifo = context_iso_urb->owner_fifo;
+       struct hfcsusb *hw = fifo->hw;
+       int k, len, errcode, offset, num_isoc_packets, fifon, maxlen,
+           status, iso_status, i;
+       __u8 *buf;
+       static __u8 eof[8];
+       __u8 s0_state;
+
+       fifon = fifo->fifonum;
+       status = urb->status;
+
+       spin_lock(&hw->lock);
+       if (fifo->stop_gracefull) {
+               fifo->stop_gracefull = 0;
+               fifo->active = 0;
+               spin_unlock(&hw->lock);
+               return;
+       }
+       spin_unlock(&hw->lock);
+
+       /*
+        * ISO transfer only partially completed,
+        * look at individual frame status for details
+        */
+       if (status == -EXDEV) {
+               if (debug & DEBUG_HW)
+                       printk(KERN_DEBUG "%s: %s: with -EXDEV "
+                           "urb->status %d, fifonum %d\n",
+                           hw->name, __func__,  status, fifon);
+
+               /* clear status, so go on with ISO transfers */
+               status = 0;
+       }
+
+       s0_state = 0;
+       if (fifo->active && !status) {
+               num_isoc_packets = iso_packets[fifon];
+               maxlen = fifo->usb_packet_maxlen;
+
+               for (k = 0; k < num_isoc_packets; ++k) {
+                       len = urb->iso_frame_desc[k].actual_length;
+                       offset = urb->iso_frame_desc[k].offset;
+                       buf = context_iso_urb->buffer + offset;
+                       iso_status = urb->iso_frame_desc[k].status;
+
+                       if (iso_status && (debug & DBG_HFC_FIFO_VERBOSE)) {
+                               printk(KERN_DEBUG "%s: %s: "
+                                   "ISO packet %i, status: %i\n",
+                                   hw->name, __func__, k, iso_status);
+                       }
+
+                       /* USB data log for every D ISO in */
+                       if ((fifon == HFCUSB_D_RX) &&
+                           (debug & DBG_HFC_USB_VERBOSE)) {
+                               printk(KERN_DEBUG
+                                   "%s: %s: %d (%d/%d) len(%d) ",
+                                   hw->name, __func__, urb->start_frame,
+                                   k, num_isoc_packets-1,
+                                   len);
+                               for (i = 0; i < len; i++)
+                                       printk("%x ", buf[i]);
+                               printk("\n");
+                       }
+
+                       if (!iso_status) {
+                               if (fifo->last_urblen != maxlen) {
+                                       /*
+                                        * save fifo fill-level threshold bits
+                                        * to use them later in TX ISO URB
+                                        * completions
+                                        */
+                                       hw->threshold_mask = buf[1];
+
+                                       if (fifon == HFCUSB_D_RX)
+                                               s0_state = (buf[0] >> 4);
+
+                                       eof[fifon] = buf[0] & 1;
+                                       if (len > 2)
+                                               hfcsusb_rx_frame(fifo, buf + 2,
+                                                       len - 2, (len < maxlen)
+                                                       ? eof[fifon] : 0);
+                               } else
+                                       hfcsusb_rx_frame(fifo, buf, len,
+                                               (len < maxlen) ?
+                                               eof[fifon] : 0);
+                               fifo->last_urblen = len;
+                       }
+               }
+
+               /* signal S0 layer1 state change */
+               if ((s0_state) && (hw->initdone) &&
+                   (s0_state != hw->dch.state)) {
+                       hw->dch.state = s0_state;
+                       schedule_event(&hw->dch, FLG_PHCHANGE);
+               }
+
+               fill_isoc_urb(urb, fifo->hw->dev, fifo->pipe,
+                             context_iso_urb->buffer, num_isoc_packets,
+                             fifo->usb_packet_maxlen, fifo->intervall,
+                             (usb_complete_t)rx_iso_complete, urb->context);
+               errcode = usb_submit_urb(urb, GFP_ATOMIC);
+               if (errcode < 0) {
+                       if (debug & DEBUG_HW)
+                               printk(KERN_DEBUG "%s: %s: error submitting "
+                                   "ISO URB: %d\n",
+                                   hw->name, __func__, errcode);
+               }
+       } else {
+               if (status && (debug & DBG_HFC_URB_INFO))
+                       printk(KERN_DEBUG "%s: %s: rx_iso_complete : "
+                           "urb->status %d, fifonum %d\n",
+                           hw->name, __func__, status, fifon);
+       }
+}
+
+/* receive completion routine for all interrupt rx fifos */
+static void
+rx_int_complete(struct urb *urb)
+{
+       int len, status, i;
+       __u8 *buf, maxlen, fifon;
+       struct usb_fifo *fifo = (struct usb_fifo *) urb->context;
+       struct hfcsusb *hw = fifo->hw;
+       static __u8 eof[8];
+
+       spin_lock(&hw->lock);
+       if (fifo->stop_gracefull) {
+               fifo->stop_gracefull = 0;
+               fifo->active = 0;
+               spin_unlock(&hw->lock);
+               return;
+       }
+       spin_unlock(&hw->lock);
+
+       fifon = fifo->fifonum;
+       if ((!fifo->active) || (urb->status)) {
+               if (debug & DBG_HFC_URB_ERROR)
+                       printk(KERN_DEBUG
+                           "%s: %s: RX-Fifo %i is going down (%i)\n",
+                           hw->name, __func__, fifon, urb->status);
+
+               fifo->urb->interval = 0; /* cancel automatic rescheduling */
+               return;
+       }
+       len = urb->actual_length;
+       buf = fifo->buffer;
+       maxlen = fifo->usb_packet_maxlen;
+
+       /* USB data log for every D INT in */
+       if ((fifon == HFCUSB_D_RX) && (debug & DBG_HFC_USB_VERBOSE)) {
+               printk(KERN_DEBUG "%s: %s: D RX INT len(%d) ",
+                   hw->name, __func__, len);
+               for (i = 0; i < len; i++)
+                       printk("%02x ", buf[i]);
+               printk("\n");
+       }
+
+       if (fifo->last_urblen != fifo->usb_packet_maxlen) {
+               /* the threshold mask is in the 2nd status byte */
+               hw->threshold_mask = buf[1];
+
+               /* signal S0 layer1 state change */
+               if (hw->initdone && ((buf[0] >> 4) != hw->dch.state)) {
+                       hw->dch.state = (buf[0] >> 4);
+                       schedule_event(&hw->dch, FLG_PHCHANGE);
+               }
+
+               eof[fifon] = buf[0] & 1;
+               /* if we have more than the 2 status bytes -> collect data */
+               if (len > 2)
+                       hfcsusb_rx_frame(fifo, buf + 2,
+                          urb->actual_length - 2,
+                          (len < maxlen) ? eof[fifon] : 0);
+       } else {
+               hfcsusb_rx_frame(fifo, buf, urb->actual_length,
+                                (len < maxlen) ? eof[fifon] : 0);
+       }
+       fifo->last_urblen = urb->actual_length;
+
+       status = usb_submit_urb(urb, GFP_ATOMIC);
+       if (status) {
+               if (debug & DEBUG_HW)
+                       printk(KERN_DEBUG "%s: %s: error resubmitting USB\n",
+                           hw->name, __func__);
+       }
+}
+
+/* transmit completion routine for all ISO tx fifos */
+static void
+tx_iso_complete(struct urb *urb)
+{
+       struct iso_urb *context_iso_urb = (struct iso_urb *) urb->context;
+       struct usb_fifo *fifo = context_iso_urb->owner_fifo;
+       struct hfcsusb *hw = fifo->hw;
+       struct sk_buff *tx_skb;
+       int k, tx_offset, num_isoc_packets, sink, remain, current_len,
+           errcode, hdlc, i;
+       int *tx_idx;
+       int frame_complete, fifon, status;
+       __u8 threshbit;
+
+       spin_lock(&hw->lock);
+       if (fifo->stop_gracefull) {
+               fifo->stop_gracefull = 0;
+               fifo->active = 0;
+               spin_unlock(&hw->lock);
+               return;
+       }
+
+       if (fifo->dch) {
+               tx_skb = fifo->dch->tx_skb;
+               tx_idx = &fifo->dch->tx_idx;
+               hdlc = 1;
+       } else if (fifo->bch) {
+               tx_skb = fifo->bch->tx_skb;
+               tx_idx = &fifo->bch->tx_idx;
+               hdlc = test_bit(FLG_HDLC, &fifo->bch->Flags);
+       } else {
+               printk(KERN_DEBUG "%s: %s: neither BCH nor DCH\n",
+                   hw->name, __func__);
+               spin_unlock(&hw->lock);
+               return;
+       }
+
+       fifon = fifo->fifonum;
+       status = urb->status;
+
+       tx_offset = 0;
+
+       /*
+        * ISO transfer only partially completed,
+        * look at individual frame status for details
+        */
+       if (status == -EXDEV) {
+               if (debug & DBG_HFC_URB_ERROR)
+                       printk(KERN_DEBUG "%s: %s: "
+                           "-EXDEV (%i) fifon (%d)\n",
+                           hw->name, __func__, status, fifon);
+
+               /* clear status, so go on with ISO transfers */
+               status = 0;
+       }
+
+       if (fifo->active && !status) {
+               /* is FifoFull-threshold set for our channel? */
+               threshbit = (hw->threshold_mask & (1 << fifon));
+               num_isoc_packets = iso_packets[fifon];
+
+               /* predict dataflow to avoid fifo overflow */
+               if (fifon >= HFCUSB_D_TX)
+                       sink = (threshbit) ? SINK_DMIN : SINK_DMAX;
+               else
+                       sink = (threshbit) ? SINK_MIN : SINK_MAX;
+               fill_isoc_urb(urb, fifo->hw->dev, fifo->pipe,
+                             context_iso_urb->buffer, num_isoc_packets,
+                             fifo->usb_packet_maxlen, fifo->intervall,
+                             (usb_complete_t)tx_iso_complete, urb->context);
+               memset(context_iso_urb->buffer, 0,
+                      sizeof(context_iso_urb->buffer));
+               frame_complete = 0;
+
+               for (k = 0; k < num_isoc_packets; ++k) {
+                       /* analyze tx success of previous ISO packets */
+                       if (debug & DBG_HFC_URB_ERROR) {
+                               errcode = urb->iso_frame_desc[k].status;
+                               if (errcode) {
+                                       printk(KERN_DEBUG "%s: %s: "
+                                           "ISO packet %i, status: %i\n",
+                                            hw->name, __func__, k, errcode);
+                               }
+                       }
+
+                       /* Generate next ISO Packets */
+                       if (tx_skb)
+                               remain = tx_skb->len - *tx_idx;
+                       else
+                               remain = 0;
+
+                       if (remain > 0) {
+                               fifo->bit_line -= sink;
+                               current_len = (0 - fifo->bit_line) / 8;
+                               if (current_len > 14)
+                                       current_len = 14;
+                               if (current_len < 0)
+                                       current_len = 0;
+                               if (remain < current_len)
+                                       current_len = remain;
+
+                               /* how much bit do we put on the line? */
+                               fifo->bit_line += current_len * 8;
+
+                               context_iso_urb->buffer[tx_offset] = 0;
+                               if (current_len == remain) {
+                                       if (hdlc) {
+                                               /* signal frame completion */
+                                               context_iso_urb->
+                                                   buffer[tx_offset] = 1;
+                                               /* add 2 byte flags and 16bit
+                                                * CRC at end of ISDN frame */
+                                               fifo->bit_line += 32;
+                                       }
+                                       frame_complete = 1;
+                               }
+
+                               /* copy tx data to iso-urb buffer */
+                               memcpy(context_iso_urb->buffer + tx_offset + 1,
+                                      (tx_skb->data + *tx_idx), current_len);
+                               *tx_idx += current_len;
+
+                               urb->iso_frame_desc[k].offset = tx_offset;
+                               urb->iso_frame_desc[k].length = current_len + 1;
+
+                               /* USB data log for every D ISO out */
+                               if ((fifon == HFCUSB_D_RX) &&
+                                   (debug & DBG_HFC_USB_VERBOSE)) {
+                                       printk(KERN_DEBUG
+                                           "%s: %s (%d/%d) offs(%d) len(%d) ",
+                                           hw->name, __func__,
+                                           k, num_isoc_packets-1,
+                                           urb->iso_frame_desc[k].offset,
+                                           urb->iso_frame_desc[k].length);
+
+                                       for (i = urb->iso_frame_desc[k].offset;
+                                            i < (urb->iso_frame_desc[k].offset
+                                            + urb->iso_frame_desc[k].length);
+                                            i++)
+                                               printk("%x ",
+                                                   context_iso_urb->buffer[i]);
+
+                                       printk(" skb->len(%i) tx-idx(%d)\n",
+                                           tx_skb->len, *tx_idx);
+                               }
+
+                               tx_offset += (current_len + 1);
+                       } else {
+                               urb->iso_frame_desc[k].offset = tx_offset++;
+                               urb->iso_frame_desc[k].length = 1;
+                               /* we lower data margin every msec */
+                               fifo->bit_line -= sink;
+                               if (fifo->bit_line < BITLINE_INF)
+                                       fifo->bit_line = BITLINE_INF;
+                       }
+
+                       if (frame_complete) {
+                               frame_complete = 0;
+
+                               if (debug & DBG_HFC_FIFO_VERBOSE) {
+                                       printk(KERN_DEBUG  "%s: %s: "
+                                           "fifon(%i) new TX len(%i): ",
+                                           hw->name, __func__,
+                                           fifon, tx_skb->len);
+                                       i = 0;
+                                       while (i < tx_skb->len)
+                                               printk("%02x ",
+                                                   tx_skb->data[i++]);
+                                       printk("\n");
+                               }
+
+                               dev_kfree_skb(tx_skb);
+                               tx_skb = NULL;
+                               if (fifo->dch && get_next_dframe(fifo->dch))
+                                       tx_skb = fifo->dch->tx_skb;
+                               else if (fifo->bch &&
+                                   get_next_bframe(fifo->bch)) {
+                                       if (test_bit(FLG_TRANSPARENT,
+                                           &fifo->bch->Flags))
+                                               confirm_Bsend(fifo->bch);
+                                       tx_skb = fifo->bch->tx_skb;
+                               }
+                       }
+               }
+               errcode = usb_submit_urb(urb, GFP_ATOMIC);
+               if (errcode < 0) {
+                       if (debug & DEBUG_HW)
+                               printk(KERN_DEBUG
+                                   "%s: %s: error submitting ISO URB: %d \n",
+                                   hw->name, __func__, errcode);
+               }
+
+               /*
+                * abuse DChannel tx iso completion to trigger NT mode state
+                * changes tx_iso_complete is assumed to be called every
+                * fifo->intervall (ms)
+                */
+               if ((fifon == HFCUSB_D_TX) && (hw->protocol == ISDN_P_NT_S0)
+                   && (hw->timers & NT_ACTIVATION_TIMER)) {
+                       if ((--hw->nt_timer) < 0)
+                               schedule_event(&hw->dch, FLG_PHCHANGE);
+               }
+
+       } else {
+               if (status && (debug & DBG_HFC_URB_ERROR))
+                       printk(KERN_DEBUG  "%s: %s: urb->status %s (%i)"
+                           "fifonum=%d\n",
+                           hw->name, __func__,
+                           symbolic(urb_errlist, status), status, fifon);
+       }
+       spin_unlock(&hw->lock);
+}
+
+/*
+ * allocs urbs and start isoc transfer with two pending urbs to avoid
+ * gaps in the transfer chain
+ */
+static int
+start_isoc_chain(struct usb_fifo *fifo, int num_packets_per_urb,
+                usb_complete_t complete, int packet_size)
+{
+       struct hfcsusb *hw = fifo->hw;
+       int i, k, errcode;
+
+       if (debug)
+               printk(KERN_DEBUG "%s: %s: fifo %i\n",
+                   hw->name, __func__, fifo->fifonum);
+
+       /* allocate Memory for Iso out Urbs */
+       for (i = 0; i < 2; i++) {
+               if (!(fifo->iso[i].urb)) {
+                       fifo->iso[i].urb =
+                           usb_alloc_urb(num_packets_per_urb, GFP_KERNEL);
+                       if (!(fifo->iso[i].urb)) {
+                               printk(KERN_DEBUG
+                                   "%s: %s: alloc urb for fifo %i failed",
+                                   hw->name, __func__, fifo->fifonum);
+                       }
+                       fifo->iso[i].owner_fifo = (struct usb_fifo *) fifo;
+                       fifo->iso[i].indx = i;
+
+                       /* Init the first iso */
+                       if (ISO_BUFFER_SIZE >=
+                           (fifo->usb_packet_maxlen *
+                            num_packets_per_urb)) {
+                               fill_isoc_urb(fifo->iso[i].urb,
+                                   fifo->hw->dev, fifo->pipe,
+                                   fifo->iso[i].buffer,
+                                   num_packets_per_urb,
+                                   fifo->usb_packet_maxlen,
+                                   fifo->intervall, complete,
+                                   &fifo->iso[i]);
+                               memset(fifo->iso[i].buffer, 0,
+                                      sizeof(fifo->iso[i].buffer));
+
+                               for (k = 0; k < num_packets_per_urb; k++) {
+                                       fifo->iso[i].urb->
+                                           iso_frame_desc[k].offset =
+                                           k * packet_size;
+                                       fifo->iso[i].urb->
+                                           iso_frame_desc[k].length =
+                                           packet_size;
+                               }
+                       } else {
+                               printk(KERN_DEBUG
+                                   "%s: %s: ISO Buffer size to small!\n",
+                                   hw->name, __func__);
+                       }
+               }
+               fifo->bit_line = BITLINE_INF;
+
+               errcode = usb_submit_urb(fifo->iso[i].urb, GFP_KERNEL);
+               fifo->active = (errcode >= 0) ? 1 : 0;
+               fifo->stop_gracefull = 0;
+               if (errcode < 0) {
+                       printk(KERN_DEBUG "%s: %s: %s URB nr:%d\n",
+                           hw->name, __func__,
+                           symbolic(urb_errlist, errcode), i);
+               }
+       }
+       return fifo->active;
+}
+
+static void
+stop_iso_gracefull(struct usb_fifo *fifo)
+{
+       struct hfcsusb *hw = fifo->hw;
+       int i, timeout;
+       u_long flags;
+
+       for (i = 0; i < 2; i++) {
+               spin_lock_irqsave(&hw->lock, flags);
+               if (debug)
+                       printk(KERN_DEBUG "%s: %s for fifo %i.%i\n",
+                              hw->name, __func__, fifo->fifonum, i);
+               fifo->stop_gracefull = 1;
+               spin_unlock_irqrestore(&hw->lock, flags);
+       }
+
+       for (i = 0; i < 2; i++) {
+               timeout = 3;
+               while (fifo->stop_gracefull && timeout--)
+                       schedule_timeout_interruptible((HZ/1000)*16);
+               if (debug && fifo->stop_gracefull)
+                       printk(KERN_DEBUG "%s: ERROR %s for fifo %i.%i\n",
+                               hw->name, __func__, fifo->fifonum, i);
+       }
+}
+
+static void
+stop_int_gracefull(struct usb_fifo *fifo)
+{
+       struct hfcsusb *hw = fifo->hw;
+       int timeout;
+       u_long flags;
+
+       spin_lock_irqsave(&hw->lock, flags);
+       if (debug)
+               printk(KERN_DEBUG "%s: %s for fifo %i\n",
+                      hw->name, __func__, fifo->fifonum);
+       fifo->stop_gracefull = 1;
+       spin_unlock_irqrestore(&hw->lock, flags);
+
+       timeout = 3;
+       while (fifo->stop_gracefull && timeout--)
+               schedule_timeout_interruptible((HZ/1000)*3);
+       if (debug && fifo->stop_gracefull)
+               printk(KERN_DEBUG "%s: ERROR %s for fifo %i\n",
+                      hw->name, __func__, fifo->fifonum);
+}
+
+/* start the interrupt transfer for the given fifo */
+static void
+start_int_fifo(struct usb_fifo *fifo)
+{
+       struct hfcsusb *hw = fifo->hw;
+       int errcode;
+
+       if (debug)
+               printk(KERN_DEBUG "%s: %s: INT IN fifo:%d\n",
+                   hw->name, __func__, fifo->fifonum);
+
+       if (!fifo->urb) {
+               fifo->urb = usb_alloc_urb(0, GFP_KERNEL);
+               if (!fifo->urb)
+                       return;
+       }
+       usb_fill_int_urb(fifo->urb, fifo->hw->dev, fifo->pipe,
+           fifo->buffer, fifo->usb_packet_maxlen,
+           (usb_complete_t)rx_int_complete, fifo, fifo->intervall);
+       fifo->active = 1;
+       fifo->stop_gracefull = 0;
+       errcode = usb_submit_urb(fifo->urb, GFP_KERNEL);
+       if (errcode) {
+               printk(KERN_DEBUG "%s: %s: submit URB: status:%i\n",
+                   hw->name, __func__, errcode);
+               fifo->active = 0;
+       }
+}
+
+static void
+setPortMode(struct hfcsusb *hw)
+{
+       if (debug & DEBUG_HW)
+               printk(KERN_DEBUG "%s: %s %s\n", hw->name, __func__,
+                  (hw->protocol == ISDN_P_TE_S0) ? "TE" : "NT");
+
+       if (hw->protocol == ISDN_P_TE_S0) {
+               write_reg(hw, HFCUSB_SCTRL, 0x40);
+               write_reg(hw, HFCUSB_SCTRL_E, 0x00);
+               write_reg(hw, HFCUSB_CLKDEL, CLKDEL_TE);
+               write_reg(hw, HFCUSB_STATES, 3 | 0x10);
+               write_reg(hw, HFCUSB_STATES, 3);
+       } else {
+               write_reg(hw, HFCUSB_SCTRL, 0x44);
+               write_reg(hw, HFCUSB_SCTRL_E, 0x09);
+               write_reg(hw, HFCUSB_CLKDEL, CLKDEL_NT);
+               write_reg(hw, HFCUSB_STATES, 1 | 0x10);
+               write_reg(hw, HFCUSB_STATES, 1);
+       }
+}
+
+static void
+reset_hfcsusb(struct hfcsusb *hw)
+{
+       struct usb_fifo *fifo;
+       int i;
+
+       if (debug & DEBUG_HW)
+               printk(KERN_DEBUG "%s: %s\n", hw->name, __func__);
+
+       /* do Chip reset */
+       write_reg(hw, HFCUSB_CIRM, 8);
+
+       /* aux = output, reset off */
+       write_reg(hw, HFCUSB_CIRM, 0x10);
+
+       /* set USB_SIZE to match the wMaxPacketSize for INT or BULK transfers */
+       write_reg(hw, HFCUSB_USB_SIZE, (hw->packet_size / 8) |
+           ((hw->packet_size / 8) << 4));
+
+       /* set USB_SIZE_I to match the the wMaxPacketSize for ISO transfers */
+       write_reg(hw, HFCUSB_USB_SIZE_I, hw->iso_packet_size);
+
+       /* enable PCM/GCI master mode */
+       write_reg(hw, HFCUSB_MST_MODE1, 0);     /* set default values */
+       write_reg(hw, HFCUSB_MST_MODE0, 1);     /* enable master mode */
+
+       /* init the fifos */
+       write_reg(hw, HFCUSB_F_THRES,
+           (HFCUSB_TX_THRESHOLD / 8) | ((HFCUSB_RX_THRESHOLD / 8) << 4));
+
+       fifo = hw->fifos;
+       for (i = 0; i < HFCUSB_NUM_FIFOS; i++) {
+               write_reg(hw, HFCUSB_FIFO, i);  /* select the desired fifo */
+               fifo[i].max_size =
+                   (i <= HFCUSB_B2_RX) ? MAX_BCH_SIZE : MAX_DFRAME_LEN;
+               fifo[i].last_urblen = 0;
+
+               /* set 2 bit for D- & E-channel */
+               write_reg(hw, HFCUSB_HDLC_PAR, ((i <= HFCUSB_B2_RX) ? 0 : 2));
+
+               /* enable all fifos */
+               if (i == HFCUSB_D_TX)
+                       write_reg(hw, HFCUSB_CON_HDLC,
+                           (hw->protocol == ISDN_P_NT_S0) ? 0x08 : 0x09);
+               else
+                       write_reg(hw, HFCUSB_CON_HDLC, 0x08);
+               write_reg(hw, HFCUSB_INC_RES_F, 2); /* reset the fifo */
+       }
+
+       write_reg(hw, HFCUSB_SCTRL_R, 0); /* disable both B receivers */
+       handle_led(hw, LED_POWER_ON);
+}
+
+/* start USB data pipes dependand on device's endpoint configuration */
+static void
+hfcsusb_start_endpoint(struct hfcsusb *hw, int channel)
+{
+       /* quick check if endpoint already running */
+       if ((channel == HFC_CHAN_D) && (hw->fifos[HFCUSB_D_RX].active))
+               return;
+       if ((channel == HFC_CHAN_B1) && (hw->fifos[HFCUSB_B1_RX].active))
+               return;
+       if ((channel == HFC_CHAN_B2) && (hw->fifos[HFCUSB_B2_RX].active))
+               return;
+       if ((channel == HFC_CHAN_E) && (hw->fifos[HFCUSB_PCM_RX].active))
+               return;
+
+       /* start rx endpoints using USB INT IN method */
+       if (hw->cfg_used == CNF_3INT3ISO || hw->cfg_used == CNF_4INT3ISO)
+               start_int_fifo(hw->fifos + channel*2 + 1);
+
+       /* start rx endpoints using USB ISO IN method */
+       if (hw->cfg_used == CNF_3ISO3ISO || hw->cfg_used == CNF_4ISO3ISO) {
+               switch (channel) {
+               case HFC_CHAN_D:
+                       start_isoc_chain(hw->fifos + HFCUSB_D_RX,
+                               ISOC_PACKETS_D,
+                               (usb_complete_t)rx_iso_complete,
+                               16);
+                       break;
+               case HFC_CHAN_E:
+                       start_isoc_chain(hw->fifos + HFCUSB_PCM_RX,
+                               ISOC_PACKETS_D,
+                               (usb_complete_t)rx_iso_complete,
+                               16);
+                       break;
+               case HFC_CHAN_B1:
+                       start_isoc_chain(hw->fifos + HFCUSB_B1_RX,
+                               ISOC_PACKETS_B,
+                               (usb_complete_t)rx_iso_complete,
+                               16);
+                       break;
+               case HFC_CHAN_B2:
+                       start_isoc_chain(hw->fifos + HFCUSB_B2_RX,
+                               ISOC_PACKETS_B,
+                               (usb_complete_t)rx_iso_complete,
+                               16);
+                       break;
+               }
+       }
+
+       /* start tx endpoints using USB ISO OUT method */
+       switch (channel) {
+       case HFC_CHAN_D:
+               start_isoc_chain(hw->fifos + HFCUSB_D_TX,
+                       ISOC_PACKETS_B,
+                       (usb_complete_t)tx_iso_complete, 1);
+               break;
+       case HFC_CHAN_B1:
+               start_isoc_chain(hw->fifos + HFCUSB_B1_TX,
+                       ISOC_PACKETS_D,
+                       (usb_complete_t)tx_iso_complete, 1);
+               break;
+       case HFC_CHAN_B2:
+               start_isoc_chain(hw->fifos + HFCUSB_B2_TX,
+                       ISOC_PACKETS_B,
+                       (usb_complete_t)tx_iso_complete, 1);
+               break;
+       }
+}
+
+/* stop USB data pipes dependand on device's endpoint configuration */
+static void
+hfcsusb_stop_endpoint(struct hfcsusb *hw, int channel)
+{
+       /* quick check if endpoint currently running */
+       if ((channel == HFC_CHAN_D) && (!hw->fifos[HFCUSB_D_RX].active))
+               return;
+       if ((channel == HFC_CHAN_B1) && (!hw->fifos[HFCUSB_B1_RX].active))
+               return;
+       if ((channel == HFC_CHAN_B2) && (!hw->fifos[HFCUSB_B2_RX].active))
+               return;
+       if ((channel == HFC_CHAN_E) && (!hw->fifos[HFCUSB_PCM_RX].active))
+               return;
+
+       /* rx endpoints using USB INT IN method */
+       if (hw->cfg_used == CNF_3INT3ISO || hw->cfg_used == CNF_4INT3ISO)
+               stop_int_gracefull(hw->fifos + channel*2 + 1);
+
+       /* rx endpoints using USB ISO IN method */
+       if (hw->cfg_used == CNF_3ISO3ISO || hw->cfg_used == CNF_4ISO3ISO)
+               stop_iso_gracefull(hw->fifos + channel*2 + 1);
+
+       /* tx endpoints using USB ISO OUT method */
+       if (channel != HFC_CHAN_E)
+               stop_iso_gracefull(hw->fifos + channel*2);
+}
+
+
+/* Hardware Initialization */
+int
+setup_hfcsusb(struct hfcsusb *hw)
+{
+       int err;
+       u_char b;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s\n", hw->name, __func__);
+
+       /* check the chip id */
+       if (read_reg_atomic(hw, HFCUSB_CHIP_ID, &b) != 1) {
+               printk(KERN_DEBUG "%s: %s: cannot read chip id\n",
+                   hw->name, __func__);
+               return 1;
+       }
+       if (b != HFCUSB_CHIPID) {
+               printk(KERN_DEBUG "%s: %s: Invalid chip id 0x%02x\n",
+                   hw->name, __func__, b);
+               return 1;
+       }
+
+       /* first set the needed config, interface and alternate */
+       err = usb_set_interface(hw->dev, hw->if_used, hw->alt_used);
+
+       hw->led_state = 0;
+
+       /* init the background machinery for control requests */
+       hw->ctrl_read.bRequestType = 0xc0;
+       hw->ctrl_read.bRequest = 1;
+       hw->ctrl_read.wLength = cpu_to_le16(1);
+       hw->ctrl_write.bRequestType = 0x40;
+       hw->ctrl_write.bRequest = 0;
+       hw->ctrl_write.wLength = 0;
+       usb_fill_control_urb(hw->ctrl_urb, hw->dev, hw->ctrl_out_pipe,
+           (u_char *)&hw->ctrl_write, NULL, 0,
+           (usb_complete_t)ctrl_complete, hw);
+
+       reset_hfcsusb(hw);
+       return 0;
+}
+
+static void
+release_hw(struct hfcsusb *hw)
+{
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s\n", hw->name, __func__);
+
+       /*
+        * stop all endpoints gracefully
+        * TODO: mISDN_core should generate CLOSE_CHANNEL
+        *       signals after calling mISDN_unregister_device()
+        */
+       hfcsusb_stop_endpoint(hw, HFC_CHAN_D);
+       hfcsusb_stop_endpoint(hw, HFC_CHAN_B1);
+       hfcsusb_stop_endpoint(hw, HFC_CHAN_B2);
+       if (hw->fifos[HFCUSB_PCM_RX].pipe)
+               hfcsusb_stop_endpoint(hw, HFC_CHAN_E);
+       if (hw->protocol == ISDN_P_TE_S0)
+               l1_event(hw->dch.l1, CLOSE_CHANNEL);
+
+       mISDN_unregister_device(&hw->dch.dev);
+       mISDN_freebchannel(&hw->bch[1]);
+       mISDN_freebchannel(&hw->bch[0]);
+       mISDN_freedchannel(&hw->dch);
+
+       if (hw->ctrl_urb) {
+               usb_kill_urb(hw->ctrl_urb);
+               usb_free_urb(hw->ctrl_urb);
+               hw->ctrl_urb = NULL;
+       }
+
+       if (hw->intf)
+               usb_set_intfdata(hw->intf, NULL);
+       list_del(&hw->list);
+       kfree(hw);
+       hw = NULL;
+}
+
+static void
+deactivate_bchannel(struct bchannel *bch)
+{
+       struct hfcsusb *hw = bch->hw;
+       u_long flags;
+
+       if (bch->debug & DEBUG_HW)
+               printk(KERN_DEBUG "%s: %s: bch->nr(%i)\n",
+                   hw->name, __func__, bch->nr);
+
+       spin_lock_irqsave(&hw->lock, flags);
+       if (test_and_clear_bit(FLG_TX_NEXT, &bch->Flags)) {
+               dev_kfree_skb(bch->next_skb);
+               bch->next_skb = NULL;
+       }
+       if (bch->tx_skb) {
+               dev_kfree_skb(bch->tx_skb);
+               bch->tx_skb = NULL;
+       }
+       bch->tx_idx = 0;
+       if (bch->rx_skb) {
+               dev_kfree_skb(bch->rx_skb);
+               bch->rx_skb = NULL;
+       }
+       clear_bit(FLG_ACTIVE, &bch->Flags);
+       clear_bit(FLG_TX_BUSY, &bch->Flags);
+       spin_unlock_irqrestore(&hw->lock, flags);
+       hfcsusb_setup_bch(bch, ISDN_P_NONE);
+       hfcsusb_stop_endpoint(hw, bch->nr);
+}
+
+/*
+ * Layer 1 B-channel hardware access
+ */
+static int
+hfc_bctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
+{
+       struct bchannel *bch = container_of(ch, struct bchannel, ch);
+       int             ret = -EINVAL;
+
+       if (bch->debug & DEBUG_HW)
+               printk(KERN_DEBUG "%s: cmd:%x %p\n", __func__, cmd, arg);
+
+       switch (cmd) {
+       case HW_TESTRX_RAW:
+       case HW_TESTRX_HDLC:
+       case HW_TESTRX_OFF:
+               ret = -EINVAL;
+               break;
+
+       case CLOSE_CHANNEL:
+               test_and_clear_bit(FLG_OPEN, &bch->Flags);
+               if (test_bit(FLG_ACTIVE, &bch->Flags))
+                       deactivate_bchannel(bch);
+               ch->protocol = ISDN_P_NONE;
+               ch->peer = NULL;
+               module_put(THIS_MODULE);
+               ret = 0;
+               break;
+       case CONTROL_CHANNEL:
+               ret = channel_bctrl(bch, arg);
+               break;
+       default:
+               printk(KERN_WARNING "%s: unknown prim(%x)\n",
+                       __func__, cmd);
+       }
+       return ret;
+}
+
+static int
+setup_instance(struct hfcsusb *hw, struct device *parent)
+{
+       u_long  flags;
+       int     err, i;
+
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_DEBUG "%s: %s\n", hw->name, __func__);
+
+       spin_lock_init(&hw->ctrl_lock);
+       spin_lock_init(&hw->lock);
+
+       mISDN_initdchannel(&hw->dch, MAX_DFRAME_LEN_L1, ph_state);
+       hw->dch.debug = debug & 0xFFFF;
+       hw->dch.hw = hw;
+       hw->dch.dev.Dprotocols = (1 << ISDN_P_TE_S0) | (1 << ISDN_P_NT_S0);
+       hw->dch.dev.D.send = hfcusb_l2l1D;
+       hw->dch.dev.D.ctrl = hfc_dctrl;
+
+       /* enable E-Channel logging */
+       if (hw->fifos[HFCUSB_PCM_RX].pipe)
+               mISDN_initdchannel(&hw->ech, MAX_DFRAME_LEN_L1, NULL);
+
+       hw->dch.dev.Bprotocols = (1 << (ISDN_P_B_RAW & ISDN_P_B_MASK)) |
+           (1 << (ISDN_P_B_HDLC & ISDN_P_B_MASK));
+       hw->dch.dev.nrbchan = 2;
+       for (i = 0; i < 2; i++) {
+               hw->bch[i].nr = i + 1;
+               set_channelmap(i + 1, hw->dch.dev.channelmap);
+               hw->bch[i].debug = debug;
+               mISDN_initbchannel(&hw->bch[i], MAX_DATA_MEM);
+               hw->bch[i].hw = hw;
+               hw->bch[i].ch.send = hfcusb_l2l1B;
+               hw->bch[i].ch.ctrl = hfc_bctrl;
+               hw->bch[i].ch.nr = i + 1;
+               list_add(&hw->bch[i].ch.list, &hw->dch.dev.bchannels);
+       }
+
+       hw->fifos[HFCUSB_B1_TX].bch = &hw->bch[0];
+       hw->fifos[HFCUSB_B1_RX].bch = &hw->bch[0];
+       hw->fifos[HFCUSB_B2_TX].bch = &hw->bch[1];
+       hw->fifos[HFCUSB_B2_RX].bch = &hw->bch[1];
+       hw->fifos[HFCUSB_D_TX].dch = &hw->dch;
+       hw->fifos[HFCUSB_D_RX].dch = &hw->dch;
+       hw->fifos[HFCUSB_PCM_RX].ech = &hw->ech;
+       hw->fifos[HFCUSB_PCM_TX].ech = &hw->ech;
+
+       err = setup_hfcsusb(hw);
+       if (err)
+               goto out;
+
+       snprintf(hw->name, MISDN_MAX_IDLEN - 1, "%s.%d", DRIVER_NAME,
+           hfcsusb_cnt + 1);
+       printk(KERN_INFO "%s: registered as '%s'\n",
+           DRIVER_NAME, hw->name);
+
+       err = mISDN_register_device(&hw->dch.dev, parent, hw->name);
+       if (err)
+               goto out;
+
+       hfcsusb_cnt++;
+       write_lock_irqsave(&HFClock, flags);
+       list_add_tail(&hw->list, &HFClist);
+       write_unlock_irqrestore(&HFClock, flags);
+       return 0;
+
+out:
+       mISDN_freebchannel(&hw->bch[1]);
+       mISDN_freebchannel(&hw->bch[0]);
+       mISDN_freedchannel(&hw->dch);
+       kfree(hw);
+       return err;
+}
+
+static int
+hfcsusb_probe(struct usb_interface *intf, const struct usb_device_id *id)
+{
+       struct hfcsusb                  *hw;
+       struct usb_device               *dev = interface_to_usbdev(intf);
+       struct usb_host_interface       *iface = intf->cur_altsetting;
+       struct usb_host_interface       *iface_used = NULL;
+       struct usb_host_endpoint        *ep;
+       struct hfcsusb_vdata            *driver_info;
+       int ifnum = iface->desc.bInterfaceNumber, i, idx, alt_idx,
+           probe_alt_setting, vend_idx, cfg_used, *vcf, attr, cfg_found,
+           ep_addr, cmptbl[16], small_match, iso_packet_size, packet_size,
+           alt_used = 0;
+
+       vend_idx = 0xffff;
+       for (i = 0; hfcsusb_idtab[i].idVendor; i++) {
+               if ((le16_to_cpu(dev->descriptor.idVendor)
+                      == hfcsusb_idtab[i].idVendor) &&
+                   (le16_to_cpu(dev->descriptor.idProduct)
+                      == hfcsusb_idtab[i].idProduct)) {
+                       vend_idx = i;
+                       continue;
+               }
+       }
+
+       printk(KERN_DEBUG
+           "%s: interface(%d) actalt(%d) minor(%d) vend_idx(%d)\n",
+           __func__, ifnum, iface->desc.bAlternateSetting,
+           intf->minor, vend_idx);
+
+       if (vend_idx == 0xffff) {
+               printk(KERN_WARNING
+                   "%s: no valid vendor found in USB descriptor\n",
+                   __func__);
+               return -EIO;
+       }
+       /* if vendor and product ID is OK, start probing alternate settings */
+       alt_idx = 0;
+       small_match = -1;
+
+       /* default settings */
+       iso_packet_size = 16;
+       packet_size = 64;
+
+       while (alt_idx < intf->num_altsetting) {
+               iface = intf->altsetting + alt_idx;
+               probe_alt_setting = iface->desc.bAlternateSetting;
+               cfg_used = 0;
+
+               while (validconf[cfg_used][0]) {
+                       cfg_found = 1;
+                       vcf = validconf[cfg_used];
+                       ep = iface->endpoint;
+                       memcpy(cmptbl, vcf, 16 * sizeof(int));
+
+                       /* check for all endpoints in this alternate setting */
+                       for (i = 0; i < iface->desc.bNumEndpoints; i++) {
+                               ep_addr = ep->desc.bEndpointAddress;
+
+                               /* get endpoint base */
+                               idx = ((ep_addr & 0x7f) - 1) * 2;
+                               if (ep_addr & 0x80)
+                                       idx++;
+                               attr = ep->desc.bmAttributes;
+
+                               if (cmptbl[idx] != EP_NOP) {
+                                       if (cmptbl[idx] == EP_NUL)
+                                               cfg_found = 0;
+                                       if (attr == USB_ENDPOINT_XFER_INT
+                                               && cmptbl[idx] == EP_INT)
+                                               cmptbl[idx] = EP_NUL;
+                                       if (attr == USB_ENDPOINT_XFER_BULK
+                                               && cmptbl[idx] == EP_BLK)
+                                               cmptbl[idx] = EP_NUL;
+                                       if (attr == USB_ENDPOINT_XFER_ISOC
+                                               && cmptbl[idx] == EP_ISO)
+                                               cmptbl[idx] = EP_NUL;
+
+                                       if (attr == USB_ENDPOINT_XFER_INT &&
+                                               ep->desc.bInterval < vcf[17]) {
+                                               cfg_found = 0;
+                                       }
+                               }
+                               ep++;
+                       }
+
+                       for (i = 0; i < 16; i++)
+                               if (cmptbl[i] != EP_NOP && cmptbl[i] != EP_NUL)
+                                       cfg_found = 0;
+
+                       if (cfg_found) {
+                               if (small_match < cfg_used) {
+                                       small_match = cfg_used;
+                                       alt_used = probe_alt_setting;
+                                       iface_used = iface;
+                               }
+                       }
+                       cfg_used++;
+               }
+               alt_idx++;
+       }       /* (alt_idx < intf->num_altsetting) */
+
+       /* not found a valid USB Ta Endpoint config */
+       if (small_match == -1)
+               return -EIO;
+
+       iface = iface_used;
+       hw = kzalloc(sizeof(struct hfcsusb), GFP_KERNEL);
+       if (!hw)
+               return -ENOMEM; /* got no mem */
+       snprintf(hw->name, MISDN_MAX_IDLEN - 1, "%s", DRIVER_NAME);
+
+       ep = iface->endpoint;
+       vcf = validconf[small_match];
+
+       for (i = 0; i < iface->desc.bNumEndpoints; i++) {
+               struct usb_fifo *f;
+
+               ep_addr = ep->desc.bEndpointAddress;
+               /* get endpoint base */
+               idx = ((ep_addr & 0x7f) - 1) * 2;
+               if (ep_addr & 0x80)
+                       idx++;
+               f = &hw->fifos[idx & 7];
+
+               /* init Endpoints */
+               if (vcf[idx] == EP_NOP || vcf[idx] == EP_NUL) {
+                       ep++;
+                       continue;
+               }
+               switch (ep->desc.bmAttributes) {
+               case USB_ENDPOINT_XFER_INT:
+                       f->pipe = usb_rcvintpipe(dev,
+                               ep->desc.bEndpointAddress);
+                       f->usb_transfer_mode = USB_INT;
+                       packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
+                       break;
+               case USB_ENDPOINT_XFER_BULK:
+                       if (ep_addr & 0x80)
+                               f->pipe = usb_rcvbulkpipe(dev,
+                                       ep->desc.bEndpointAddress);
+                       else
+                               f->pipe = usb_sndbulkpipe(dev,
+                                       ep->desc.bEndpointAddress);
+                       f->usb_transfer_mode = USB_BULK;
+                       packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
+                       break;
+               case USB_ENDPOINT_XFER_ISOC:
+                       if (ep_addr & 0x80)
+                               f->pipe = usb_rcvisocpipe(dev,
+                                       ep->desc.bEndpointAddress);
+                       else
+                               f->pipe = usb_sndisocpipe(dev,
+                                       ep->desc.bEndpointAddress);
+                       f->usb_transfer_mode = USB_ISOC;
+                       iso_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
+                       break;
+               default:
+                       f->pipe = 0;
+               }
+
+               if (f->pipe) {
+                       f->fifonum = idx & 7;
+                       f->hw = hw;
+                       f->usb_packet_maxlen =
+                           le16_to_cpu(ep->desc.wMaxPacketSize);
+                       f->intervall = ep->desc.bInterval;
+               }
+               ep++;
+       }
+       hw->dev = dev; /* save device */
+       hw->if_used = ifnum; /* save used interface */
+       hw->alt_used = alt_used; /* and alternate config */
+       hw->ctrl_paksize = dev->descriptor.bMaxPacketSize0; /* control size */
+       hw->cfg_used = vcf[16]; /* store used config */
+       hw->vend_idx = vend_idx; /* store found vendor */
+       hw->packet_size = packet_size;
+       hw->iso_packet_size = iso_packet_size;
+
+       /* create the control pipes needed for register access */
+       hw->ctrl_in_pipe = usb_rcvctrlpipe(hw->dev, 0);
+       hw->ctrl_out_pipe = usb_sndctrlpipe(hw->dev, 0);
+       hw->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);
+
+       driver_info =
+               (struct hfcsusb_vdata *)hfcsusb_idtab[vend_idx].driver_info;
+       printk(KERN_DEBUG "%s: %s: detected \"%s\" (%s, if=%d alt=%d)\n",
+           hw->name, __func__, driver_info->vend_name,
+           conf_str[small_match], ifnum, alt_used);
+
+       if (setup_instance(hw, dev->dev.parent))
+               return -EIO;
+
+       hw->intf = intf;
+       usb_set_intfdata(hw->intf, hw);
+       return 0;
+}
+
+/* function called when an active device is removed */
+static void
+hfcsusb_disconnect(struct usb_interface *intf)
+{
+       struct hfcsusb *hw = usb_get_intfdata(intf);
+       struct hfcsusb *next;
+       int cnt = 0;
+
+       printk(KERN_INFO "%s: device disconnected\n", hw->name);
+
+       handle_led(hw, LED_POWER_OFF);
+       release_hw(hw);
+
+       list_for_each_entry_safe(hw, next, &HFClist, list)
+               cnt++;
+       if (!cnt)
+               hfcsusb_cnt = 0;
+
+       usb_set_intfdata(intf, NULL);
+}
+
+static struct usb_driver hfcsusb_drv = {
+       .name = DRIVER_NAME,
+       .id_table = hfcsusb_idtab,
+       .probe = hfcsusb_probe,
+       .disconnect = hfcsusb_disconnect,
+};
+
+static int __init
+hfcsusb_init(void)
+{
+       printk(KERN_INFO DRIVER_NAME " driver Rev. %s debug(0x%x) poll(%i)\n",
+           hfcsusb_rev, debug, poll);
+
+       if (usb_register(&hfcsusb_drv)) {
+               printk(KERN_INFO DRIVER_NAME
+                   ": Unable to register hfcsusb module at usb stack\n");
+               return -ENODEV;
+       }
+
+       return 0;
+}
+
+static void __exit
+hfcsusb_cleanup(void)
+{
+       if (debug & DBG_HFC_CALL_TRACE)
+               printk(KERN_INFO DRIVER_NAME ": %s\n", __func__);
+
+       /* unregister Hardware */
+       usb_deregister(&hfcsusb_drv);   /* release our driver */
+}
+
+module_init(hfcsusb_init);
+module_exit(hfcsusb_cleanup);
diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.h b/drivers/isdn/hardware/mISDN/hfcsusb.h
new file mode 100644 (file)
index 0000000..098486b
--- /dev/null
@@ -0,0 +1,418 @@
+/*
+ * hfcsusb.h, HFC-S USB mISDN driver
+ */
+
+#ifndef __HFCSUSB_H__
+#define __HFCSUSB_H__
+
+
+#define DRIVER_NAME "HFC-S_USB"
+
+#define DBG_HFC_CALL_TRACE     0x00010000
+#define DBG_HFC_FIFO_VERBOSE   0x00020000
+#define DBG_HFC_USB_VERBOSE    0x00100000
+#define DBG_HFC_URB_INFO       0x00200000
+#define DBG_HFC_URB_ERROR      0x00400000
+
+#define DEFAULT_TRANSP_BURST_SZ 128
+
+#define HFC_CTRL_TIMEOUT       20      /* 5ms timeout writing/reading regs */
+#define CLKDEL_TE              0x0f    /* CLKDEL in TE mode */
+#define CLKDEL_NT              0x6c    /* CLKDEL in NT mode */
+
+/* hfcsusb Layer1 commands */
+#define HFC_L1_ACTIVATE_TE             1
+#define HFC_L1_ACTIVATE_NT             2
+#define HFC_L1_DEACTIVATE_NT           3
+#define HFC_L1_FORCE_DEACTIVATE_TE     4
+
+/* cmd FLAGS in HFCUSB_STATES register */
+#define HFCUSB_LOAD_STATE      0x10
+#define HFCUSB_ACTIVATE                0x20
+#define HFCUSB_DO_ACTION       0x40
+#define HFCUSB_NT_G2_G3                0x80
+
+/* timers */
+#define NT_ACTIVATION_TIMER    0x01    /* enables NT mode activation Timer */
+#define NT_T1_COUNT            10
+
+#define MAX_BCH_SIZE           2048    /* allowed B-channel packet size */
+
+#define HFCUSB_RX_THRESHOLD    64      /* threshold for fifo report bit rx */
+#define HFCUSB_TX_THRESHOLD    96      /* threshold for fifo report bit tx */
+
+#define HFCUSB_CHIP_ID         0x16    /* Chip ID register index */
+#define HFCUSB_CIRM            0x00    /* cirm register index */
+#define HFCUSB_USB_SIZE                0x07    /* int length register */
+#define HFCUSB_USB_SIZE_I      0x06    /* iso length register */
+#define HFCUSB_F_CROSS         0x0b    /* bit order register */
+#define HFCUSB_CLKDEL          0x37    /* bit delay register */
+#define HFCUSB_CON_HDLC                0xfa    /* channel connect register */
+#define HFCUSB_HDLC_PAR                0xfb
+#define HFCUSB_SCTRL           0x31    /* S-bus control register (tx) */
+#define HFCUSB_SCTRL_E         0x32    /* same for E and special funcs */
+#define HFCUSB_SCTRL_R         0x33    /* S-bus control register (rx) */
+#define HFCUSB_F_THRES         0x0c    /* threshold register */
+#define HFCUSB_FIFO            0x0f    /* fifo select register */
+#define HFCUSB_F_USAGE         0x1a    /* fifo usage register */
+#define HFCUSB_MST_MODE0       0x14
+#define HFCUSB_MST_MODE1       0x15
+#define HFCUSB_P_DATA          0x1f
+#define HFCUSB_INC_RES_F       0x0e
+#define HFCUSB_B1_SSL          0x20
+#define HFCUSB_B2_SSL          0x21
+#define HFCUSB_B1_RSL          0x24
+#define HFCUSB_B2_RSL          0x25
+#define HFCUSB_STATES          0x30
+
+
+#define HFCUSB_CHIPID          0x40    /* ID value of HFC-S USB */
+
+/* fifo registers */
+#define HFCUSB_NUM_FIFOS       8       /* maximum number of fifos */
+#define HFCUSB_B1_TX           0       /* index for B1 transmit bulk/int */
+#define HFCUSB_B1_RX           1       /* index for B1 receive bulk/int */
+#define HFCUSB_B2_TX           2
+#define HFCUSB_B2_RX           3
+#define HFCUSB_D_TX            4
+#define HFCUSB_D_RX            5
+#define HFCUSB_PCM_TX          6
+#define HFCUSB_PCM_RX          7
+
+
+#define USB_INT                0
+#define USB_BULK       1
+#define USB_ISOC       2
+
+#define ISOC_PACKETS_D 8
+#define ISOC_PACKETS_B 8
+#define ISO_BUFFER_SIZE        128
+
+/* defines how much ISO packets are handled in one URB */
+static int iso_packets[8] =
+    { ISOC_PACKETS_B, ISOC_PACKETS_B, ISOC_PACKETS_B, ISOC_PACKETS_B,
+       ISOC_PACKETS_D, ISOC_PACKETS_D, ISOC_PACKETS_D, ISOC_PACKETS_D
+};
+
+
+/* Fifo flow Control for TX ISO */
+#define SINK_MAX       68
+#define SINK_MIN       48
+#define SINK_DMIN      12
+#define SINK_DMAX      18
+#define BITLINE_INF    (-96*8)
+
+/* HFC-S USB register access by Control-URSs */
+#define write_reg_atomic(a, b, c) \
+       usb_control_msg((a)->dev, (a)->ctrl_out_pipe, 0, 0x40, (c), (b), \
+               0, 0, HFC_CTRL_TIMEOUT)
+#define read_reg_atomic(a, b, c) \
+       usb_control_msg((a)->dev, (a)->ctrl_in_pipe, 1, 0xC0, 0, (b), (c), \
+               1, HFC_CTRL_TIMEOUT)
+#define HFC_CTRL_BUFSIZE 64
+
+struct ctrl_buf {
+       __u8 hfcs_reg;          /* register number */
+       __u8 reg_val;           /* value to be written (or read) */
+};
+
+/*
+ * URB error codes
+ * Used to represent a list of values and their respective symbolic names
+ */
+struct hfcusb_symbolic_list {
+       const int num;
+       const char *name;
+};
+
+static struct hfcusb_symbolic_list urb_errlist[] = {
+       {-ENOMEM, "No memory for allocation of internal structures"},
+       {-ENOSPC, "The host controller's bandwidth is already consumed"},
+       {-ENOENT, "URB was canceled by unlink_urb"},
+       {-EXDEV, "ISO transfer only partially completed"},
+       {-EAGAIN, "Too match scheduled for the future"},
+       {-ENXIO, "URB already queued"},
+       {-EFBIG, "Too much ISO frames requested"},
+       {-ENOSR, "Buffer error (overrun)"},
+       {-EPIPE, "Specified endpoint is stalled (device not responding)"},
+       {-EOVERFLOW, "Babble (bad cable?)"},
+       {-EPROTO, "Bit-stuff error (bad cable?)"},
+       {-EILSEQ, "CRC/Timeout"},
+       {-ETIMEDOUT, "NAK (device does not respond)"},
+       {-ESHUTDOWN, "Device unplugged"},
+       {-1, NULL}
+};
+
+static inline const char *
+symbolic(struct hfcusb_symbolic_list list[], const int num)
+{
+       int i;
+       for (i = 0; list[i].name != NULL; i++)
+               if (list[i].num == num)
+                       return list[i].name;
+       return "<unkown USB Error>";
+}
+
+/* USB descriptor need to contain one of the following EndPoint combination: */
+#define CNF_4INT3ISO   1       /* 4 INT IN, 3 ISO OUT */
+#define CNF_3INT3ISO   2       /* 3 INT IN, 3 ISO OUT */
+#define CNF_4ISO3ISO   3       /* 4 ISO IN, 3 ISO OUT */
+#define CNF_3ISO3ISO   4       /* 3 ISO IN, 3 ISO OUT */
+
+#define EP_NUL 1       /* Endpoint at this position not allowed */
+#define EP_NOP 2       /* all type of endpoints allowed at this position */
+#define EP_ISO 3       /* Isochron endpoint mandatory at this position */
+#define EP_BLK 4       /* Bulk endpoint mandatory at this position */
+#define EP_INT 5       /* Interrupt endpoint mandatory at this position */
+
+#define HFC_CHAN_B1    0
+#define HFC_CHAN_B2    1
+#define HFC_CHAN_D     2
+#define HFC_CHAN_E     3
+
+
+/*
+ * List of all supported enpoints configiration sets, used to find the
+ * best matching endpoint configuration within a devices' USB descriptor.
+ * We need at least 3 RX endpoints, and 3 TX endpoints, either
+ * INT-in and ISO-out, or ISO-in and ISO-out)
+ * with 4 RX endpoints even E-Channel logging is possible
+ */
+static int
+validconf[][19] = {
+       /* INT in, ISO out config */
+       {EP_NUL, EP_INT, EP_NUL, EP_INT, EP_NUL, EP_INT, EP_NOP, EP_INT,
+        EP_ISO, EP_NUL, EP_ISO, EP_NUL, EP_ISO, EP_NUL, EP_NUL, EP_NUL,
+        CNF_4INT3ISO, 2, 1},
+       {EP_NUL, EP_INT, EP_NUL, EP_INT, EP_NUL, EP_INT, EP_NUL, EP_NUL,
+        EP_ISO, EP_NUL, EP_ISO, EP_NUL, EP_ISO, EP_NUL, EP_NUL, EP_NUL,
+        CNF_3INT3ISO, 2, 0},
+       /* ISO in, ISO out config */
+       {EP_NOP, EP_NOP, EP_NOP, EP_NOP, EP_NOP, EP_NOP, EP_NOP, EP_NOP,
+        EP_ISO, EP_ISO, EP_ISO, EP_ISO, EP_ISO, EP_ISO, EP_NOP, EP_ISO,
+        CNF_4ISO3ISO, 2, 1},
+       {EP_NUL, EP_NUL, EP_NUL, EP_NUL, EP_NUL, EP_NUL, EP_NUL, EP_NUL,
+        EP_ISO, EP_ISO, EP_ISO, EP_ISO, EP_ISO, EP_ISO, EP_NUL, EP_NUL,
+        CNF_3ISO3ISO, 2, 0},
+       {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} /* EOL element */
+};
+
+/* string description of chosen config */
+char *conf_str[] = {
+       "4 Interrupt IN + 3 Isochron OUT",
+       "3 Interrupt IN + 3 Isochron OUT",
+       "4 Isochron IN + 3 Isochron OUT",
+       "3 Isochron IN + 3 Isochron OUT"
+};
+
+
+#define LED_OFF                0       /* no LED support */
+#define LED_SCHEME1    1       /* LED standard scheme */
+#define LED_SCHEME2    2       /* not used yet... */
+
+#define LED_POWER_ON   1
+#define LED_POWER_OFF  2
+#define LED_S0_ON      3
+#define LED_S0_OFF     4
+#define LED_B1_ON      5
+#define LED_B1_OFF     6
+#define LED_B1_DATA    7
+#define LED_B2_ON      8
+#define LED_B2_OFF     9
+#define LED_B2_DATA    10
+
+#define LED_NORMAL     0       /* LEDs are normal */
+#define LED_INVERTED   1       /* LEDs are inverted */
+
+/* time in ms to perform a Flashing LED when B-Channel has traffic */
+#define LED_TIME      250
+
+
+
+struct hfcsusb;
+struct usb_fifo;
+
+/* structure defining input+output fifos (interrupt/bulk mode) */
+struct iso_urb {
+       struct urb *urb;
+       __u8 buffer[ISO_BUFFER_SIZE];   /* buffer rx/tx USB URB data */
+       struct usb_fifo *owner_fifo;    /* pointer to owner fifo */
+       __u8 indx; /* Fifos's ISO double buffer 0 or 1 ? */
+#ifdef ISO_FRAME_START_DEBUG
+       int start_frames[ISO_FRAME_START_RING_COUNT];
+       __u8 iso_frm_strt_pos; /* index in start_frame[] */
+#endif
+};
+
+struct usb_fifo {
+       int fifonum;            /* fifo index attached to this structure */
+       int active;             /* fifo is currently active */
+       struct hfcsusb *hw;     /* pointer to main structure */
+       int pipe;               /* address of endpoint */
+       __u8 usb_packet_maxlen; /* maximum length for usb transfer */
+       unsigned int max_size;  /* maximum size of receive/send packet */
+       __u8 intervall;         /* interrupt interval */
+       struct urb *urb;        /* transfer structure for usb routines */
+       __u8 buffer[128];       /* buffer USB INT OUT URB data */
+       int bit_line;           /* how much bits are in the fifo? */
+
+       __u8 usb_transfer_mode; /* switched between ISO and INT */
+       struct iso_urb  iso[2]; /* two urbs to have one always
+                                        one pending */
+
+       struct dchannel *dch;   /* link to hfcsusb_t->dch */
+       struct bchannel *bch;   /* link to hfcsusb_t->bch */
+       struct dchannel *ech;   /* link to hfcsusb_t->ech, TODO: E-CHANNEL */
+       int last_urblen;        /* remember length of last packet */
+       __u8 stop_gracefull;    /* stops URB retransmission */
+};
+
+struct hfcsusb {
+       struct list_head        list;
+       struct dchannel         dch;
+       struct bchannel         bch[2];
+       struct dchannel         ech; /* TODO : wait for struct echannel ;) */
+
+       struct usb_device       *dev;           /* our device */
+       struct usb_interface    *intf;          /* used interface */
+       int                     if_used;        /* used interface number */
+       int                     alt_used;       /* used alternate config */
+       int                     cfg_used;       /* configuration index used */
+       int                     vend_idx;       /* index in hfcsusb_idtab */
+       int                     packet_size;
+       int                     iso_packet_size;
+       struct usb_fifo         fifos[HFCUSB_NUM_FIFOS];
+
+       /* control pipe background handling */
+       struct ctrl_buf         ctrl_buff[HFC_CTRL_BUFSIZE];
+       int                     ctrl_in_idx, ctrl_out_idx, ctrl_cnt;
+       struct urb              *ctrl_urb;
+       struct usb_ctrlrequest  ctrl_write;
+       struct usb_ctrlrequest  ctrl_read;
+       int                     ctrl_paksize;
+       int                     ctrl_in_pipe, ctrl_out_pipe;
+       spinlock_t              ctrl_lock; /* lock for ctrl */
+       spinlock_t              lock;
+
+       __u8                    threshold_mask;
+       __u8                    led_state;
+
+       __u8                    protocol;
+       int                     nt_timer;
+       int                     open;
+       __u8                    timers;
+       __u8                    initdone;
+       char                    name[MISDN_MAX_IDLEN];
+};
+
+/* private vendor specific data */
+struct hfcsusb_vdata {
+       __u8            led_scheme;  /* led display scheme */
+       signed short    led_bits[8]; /* array of 8 possible LED bitmask */
+       char            *vend_name;  /* device name */
+};
+
+
+#define HFC_MAX_TE_LAYER1_STATE 8
+#define HFC_MAX_NT_LAYER1_STATE 4
+
+const char *HFC_TE_LAYER1_STATES[HFC_MAX_TE_LAYER1_STATE + 1] = {
+       "TE F0 - Reset",
+       "TE F1 - Reset",
+       "TE F2 - Sensing",
+       "TE F3 - Deactivated",
+       "TE F4 - Awaiting signal",
+       "TE F5 - Identifying input",
+       "TE F6 - Synchronized",
+       "TE F7 - Activated",
+       "TE F8 - Lost framing",
+};
+
+const char *HFC_NT_LAYER1_STATES[HFC_MAX_NT_LAYER1_STATE + 1] = {
+       "NT G0 - Reset",
+       "NT G1 - Deactive",
+       "NT G2 - Pending activation",
+       "NT G3 - Active",
+       "NT G4 - Pending deactivation",
+};
+
+/* supported devices */
+static struct usb_device_id hfcsusb_idtab[] = {
+       {
+        USB_DEVICE(0x0959, 0x2bd0),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_OFF, {4, 0, 2, 1},
+                          "ISDN USB TA (Cologne Chip HFC-S USB based)"}),
+       },
+       {
+        USB_DEVICE(0x0675, 0x1688),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {1, 2, 0, 0},
+                          "DrayTek miniVigor 128 USB ISDN TA"}),
+       },
+       {
+        USB_DEVICE(0x07b0, 0x0007),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {0x80, -64, -32, -16},
+                          "Billion tiny USB ISDN TA 128"}),
+       },
+       {
+        USB_DEVICE(0x0742, 0x2008),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {4, 0, 2, 1},
+                          "Stollmann USB TA"}),
+       },
+       {
+        USB_DEVICE(0x0742, 0x2009),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {4, 0, 2, 1},
+                          "Aceex USB ISDN TA"}),
+       },
+       {
+        USB_DEVICE(0x0742, 0x200A),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {4, 0, 2, 1},
+                          "OEM USB ISDN TA"}),
+       },
+       {
+        USB_DEVICE(0x08e3, 0x0301),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {2, 0, 1, 4},
+                          "Olitec USB RNIS"}),
+       },
+       {
+        USB_DEVICE(0x07fa, 0x0846),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {0x80, -64, -32, -16},
+                          "Bewan Modem RNIS USB"}),
+       },
+       {
+        USB_DEVICE(0x07fa, 0x0847),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {0x80, -64, -32, -16},
+                          "Djinn Numeris USB"}),
+       },
+       {
+        USB_DEVICE(0x07b0, 0x0006),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {0x80, -64, -32, -16},
+                          "Twister ISDN TA"}),
+       },
+       {
+        USB_DEVICE(0x071d, 0x1005),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {0x02, 0, 0x01, 0x04},
+                          "Eicon DIVA USB 4.0"}),
+       },
+       {
+        USB_DEVICE(0x0586, 0x0102),
+        .driver_info = (unsigned long) &((struct hfcsusb_vdata)
+                         {LED_SCHEME1, {0x88, -64, -32, -16},
+                          "ZyXEL OMNI.NET USB II"}),
+       },
+       { }
+};
+
+MODULE_DEVICE_TABLE(usb, hfcsusb_idtab);
+
+#endif /* __HFCSUSB_H__ */