mISDN: Add HFC USB driver

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>

4 files changed, 2622 insertions, 0 deletions

diff --git a/drivers/isdn/hardware/mISDN/Kconfig b/drivers/isdn/hardware/mISDN/Kconfig
index 14793480c45..fd112ae252c 100644
--- a/drivers/isdn/hardware/mISDN/Kconfig
+++ b/drivers/isdn/hardware/mISDN/Kconfig
@@ -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
+
diff --git a/drivers/isdn/hardware/mISDN/Makefile b/drivers/isdn/hardware/mISDN/Makefile
index 1e7ca5332ad..b0403526bbb 100644
--- a/drivers/isdn/hardware/mISDN/Makefile
+++ b/drivers/isdn/hardware/mISDN/Makefile
@@ -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
index 00000000000..ba6925fbf38
--- /dev/null
+++ b/drivers/isdn/hardware/mISDN/hfcsusb.c
@@ -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