/*
   * USB driver for Gigaset 307x directly or using M105 Data.
   *
   * Copyright (c) 2001 by Stefan Eilers
   *                   and Hansjoerg Lipp <hjlipp@web.de>.
   *
   * This driver was derived from the USB skeleton driver by
   * Greg Kroah-Hartman <greg@kroah.com>
   *
   * =====================================================================
   *	This program is free software; you can redistribute it and/or
   *	modify it under the terms of the GNU General Public License as
   *	published by the Free Software Foundation; either version 2 of
   *	the License, or (at your option) any later version.
   * =====================================================================
   */
  
  #include "gigaset.h"
  #include <linux/usb.h>
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  
  /* Version Information */
  #define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  #define DRIVER_DESC "USB Driver for Gigaset 307x using M105"
  
  /* Module parameters */
  
  static int startmode = SM_ISDN;
  static int cidmode = 1;
  
  module_param(startmode, int, S_IRUGO);
  module_param(cidmode, int, S_IRUGO);
  MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  MODULE_PARM_DESC(cidmode, "Call-ID mode");
  
  #define GIGASET_MINORS     1
  #define GIGASET_MINOR      8
  #define GIGASET_MODULENAME "usb_gigaset"
  #define GIGASET_DEVNAME    "ttyGU"
  
  /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  #define IF_WRITEBUF 264
  
  /* Values for the Gigaset M105 Data */
  #define USB_M105_VENDOR_ID	0x0681
  #define USB_M105_PRODUCT_ID	0x0009
  
  /* table of devices that work with this driver */
  static const struct usb_device_id gigaset_table[] = {
  	{ USB_DEVICE(USB_M105_VENDOR_ID, USB_M105_PRODUCT_ID) },
  	{ }					/* Terminating entry */
  };
  
  MODULE_DEVICE_TABLE(usb, gigaset_table);
  
  /*
   * Control requests (empty fields: 00)
   *
   *       RT|RQ|VALUE|INDEX|LEN  |DATA
   * In:
   *       C1 08             01
   *            Get flags (1 byte). Bits: 0=dtr,1=rts,3-7:?
   *       C1 0F             ll ll
   *            Get device information/status (llll: 0x200 and 0x40 seen).
   *            Real size: I only saw MIN(llll,0x64).
   *            Contents: seems to be always the same...
   *              offset 0x00: Length of this structure (0x64) (len: 1,2,3 bytes)
   *              offset 0x3c: String (16 bit chars): "MCCI USB Serial V2.0"
   *              rest:        ?
   * Out:
   *       41 11
   *            Initialize/reset device ?
   *       41 00 xx 00
   *            ? (xx=00 or 01; 01 on start, 00 on close)
   *       41 07 vv mm
   *            Set/clear flags vv=value, mm=mask (see RQ 08)
   *       41 12 xx
   *            Used before the following configuration requests are issued
   *            (with xx=0x0f). I've seen other values<0xf, though.
   *       41 01 xx xx
   *            Set baud rate. xxxx=ceil(0x384000/rate)=trunc(0x383fff/rate)+1.
   *       41 03 ps bb
   *            Set byte size and parity. p:  0x20=even,0x10=odd,0x00=no parity
   *                                     [    0x30: m, 0x40: s           ]
   *                                     [s:  0: 1 stop bit; 1: 1.5; 2: 2]
   *                                      bb: bits/byte (seen 7 and 8)
   *       41 13 -- -- -- -- 10 00 ww 00 00 00 xx 00 00 00 yy 00 00 00 zz 00 00 00
   *            ??
   *            Initialization: 01, 40, 00, 00
   *            Open device:    00  40, 00, 00
   *            yy and zz seem to be equal, either 0x00 or 0x0a
   *            (ww,xx) pairs seen: (00,00), (00,40), (01,40), (09,80), (19,80)
   *       41 19 -- -- -- -- 06 00 00 00 00 xx 11 13
   *            Used after every "configuration sequence" (RQ 12, RQs 01/03/13).
   *            xx is usually 0x00 but was 0x7e before starting data transfer
   *            in unimodem mode. So, this might be an array of characters that
   *            need special treatment ("commit all bufferd data"?), 11=^Q, 13=^S.
   *
   * Unimodem mode: use "modprobe ppp_async flag_time=0" as the device _needs_ two
   * flags per packet.
   */
  
  /* functions called if a device of this driver is connected/disconnected */
  static int gigaset_probe(struct usb_interface *interface,
  			 const struct usb_device_id *id);
  static void gigaset_disconnect(struct usb_interface *interface);
  
  /* functions called before/after suspend */
  static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
  static int gigaset_resume(struct usb_interface *intf);
  static int gigaset_pre_reset(struct usb_interface *intf);
  
  static struct gigaset_driver *driver;
  
  /* usb specific object needed to register this driver with the usb subsystem */
  static struct usb_driver gigaset_usb_driver = {
  	.name =		GIGASET_MODULENAME,
  	.probe =	gigaset_probe,
  	.disconnect =	gigaset_disconnect,
  	.id_table =	gigaset_table,
  	.suspend =	gigaset_suspend,
  	.resume =	gigaset_resume,
  	.reset_resume =	gigaset_resume,
  	.pre_reset =	gigaset_pre_reset,
  	.post_reset =	gigaset_resume,
  	.disable_hub_initiated_lpm = 1,
  };
  
  struct usb_cardstate {
  	struct usb_device	*udev;		/* usb device pointer */
  	struct usb_interface	*interface;	/* interface for this device */
  	int			busy;		/* bulk output in progress */
  
  	/* Output buffer */
  	unsigned char		*bulk_out_buffer;
  	int			bulk_out_size;
  	__u8			bulk_out_endpointAddr;
  	struct urb		*bulk_out_urb;
  
  	/* Input buffer */
  	unsigned char		*rcvbuf;
  	int			rcvbuf_size;
  	struct urb		*read_urb;
  	__u8			int_in_endpointAddr;
  
  	char			bchars[6];		/* for request 0x19 */
  };
  
  static inline unsigned tiocm_to_gigaset(unsigned state)
  {
  	return ((state & TIOCM_DTR) ? 1 : 0) | ((state & TIOCM_RTS) ? 2 : 0);
  }
  
  static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
  				  unsigned new_state)
  {
  	struct usb_device *udev = cs->hw.usb->udev;
  	unsigned mask, val;
  	int r;
  
  	mask = tiocm_to_gigaset(old_state ^ new_state);
  	val = tiocm_to_gigaset(new_state);
  
  	gig_dbg(DEBUG_USBREQ, "set flags 0x%02x with mask 0x%02x", val, mask);
  	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 7, 0x41,
  			    (val & 0xff) | ((mask & 0xff) << 8), 0,
  			    NULL, 0, 2000 /* timeout? */);
  	if (r < 0)
  		return r;
  	return 0;
  }
  
  /*
   * Set M105 configuration value
   * using undocumented device commands reverse engineered from USB traces
   * of the Siemens Windows driver
   */
  static int set_value(struct cardstate *cs, u8 req, u16 val)
  {
  	struct usb_device *udev = cs->hw.usb->udev;
  	int r, r2;
  
  	gig_dbg(DEBUG_USBREQ, "request %02x (%04x)",
  		(unsigned)req, (unsigned)val);
  	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x12, 0x41,
  			    0xf /*?*/, 0, NULL, 0, 2000 /*?*/);
  	/* no idea what this does */
  	if (r < 0) {
  		dev_err(&udev->dev, "error %d on request 0x12
  ", -r);
  		return r;
  	}
  
  	r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), req, 0x41,
  			    val, 0, NULL, 0, 2000 /*?*/);
  	if (r < 0)
  		dev_err(&udev->dev, "error %d on request 0x%02x
  ",
  			-r, (unsigned)req);
  
  	r2 = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
  			     0, 0, cs->hw.usb->bchars, 6, 2000 /*?*/);
  	if (r2 < 0)
  		dev_err(&udev->dev, "error %d on request 0x19
  ", -r2);
  
  	return r < 0 ? r : (r2 < 0 ? r2 : 0);
  }
  
  /*
   * set the baud rate on the internal serial adapter
   * using the undocumented parameter setting command
   */
  static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
  {
  	u16 val;
  	u32 rate;
  
  	cflag &= CBAUD;
  
  	switch (cflag) {
  	case    B300: rate =     300; break;
  	case    B600: rate =     600; break;
  	case   B1200: rate =    1200; break;
  	case   B2400: rate =    2400; break;
  	case   B4800: rate =    4800; break;
  	case   B9600: rate =    9600; break;
  	case  B19200: rate =   19200; break;
  	case  B38400: rate =   38400; break;
  	case  B57600: rate =   57600; break;
  	case B115200: rate =  115200; break;
  	default:
  		rate =  9600;
  		dev_err(cs->dev, "unsupported baudrate request 0x%x,"
  			" using default of B9600
  ", cflag);
  	}
  
  	val = 0x383fff / rate + 1;
  
  	return set_value(cs, 1, val);
  }
  
  /*
   * set the line format on the internal serial adapter
   * using the undocumented parameter setting command
   */
  static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
  {
  	u16 val = 0;
  
  	/* set the parity */
  	if (cflag & PARENB)
  		val |= (cflag & PARODD) ? 0x10 : 0x20;
  
  	/* set the number of data bits */
  	switch (cflag & CSIZE) {
  	case CS5:
  		val |= 5 << 8; break;
  	case CS6:
  		val |= 6 << 8; break;
  	case CS7:
  		val |= 7 << 8; break;
  	case CS8:
  		val |= 8 << 8; break;
  	default:
  		dev_err(cs->dev, "CSIZE was not CS5-CS8, using default of 8
  ");
  		val |= 8 << 8;
  		break;
  	}
  
  	/* set the number of stop bits */
  	if (cflag & CSTOPB) {
  		if ((cflag & CSIZE) == CS5)
  			val |= 1; /* 1.5 stop bits */
  		else
  			val |= 2; /* 2 stop bits */
  	}
  
  	return set_value(cs, 3, val);
  }
  
  
  /*============================================================================*/
  static int gigaset_init_bchannel(struct bc_state *bcs)
  {
  	/* nothing to do for M10x */
  	gigaset_bchannel_up(bcs);
  	return 0;
  }
  
  static int gigaset_close_bchannel(struct bc_state *bcs)
  {
  	/* nothing to do for M10x */
  	gigaset_bchannel_down(bcs);
  	return 0;
  }
  
  static int write_modem(struct cardstate *cs);
  static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb);
  
  
  /* Write tasklet handler: Continue sending current skb, or send command, or
   * start sending an skb from the send queue.
   */
  static void gigaset_modem_fill(unsigned long data)
  {
  	struct cardstate *cs = (struct cardstate *) data;
  	struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
  	struct cmdbuf_t *cb;
  	int again;
  
  	gig_dbg(DEBUG_OUTPUT, "modem_fill");
  
  	if (cs->hw.usb->busy) {
  		gig_dbg(DEBUG_OUTPUT, "modem_fill: busy");
  		return;
  	}
  
  	do {
  		again = 0;
  		if (!bcs->tx_skb) { /* no skb is being sent */
  			cb = cs->cmdbuf;
  			if (cb) { /* commands to send? */
  				gig_dbg(DEBUG_OUTPUT, "modem_fill: cb");
  				if (send_cb(cs, cb) < 0) {
  					gig_dbg(DEBUG_OUTPUT,
  						"modem_fill: send_cb failed");
  					again = 1; /* no callback will be
  						      called! */
  				}
  			} else { /* skbs to send? */
  				bcs->tx_skb = skb_dequeue(&bcs->squeue);
  				if (bcs->tx_skb)
  					gig_dbg(DEBUG_INTR,
  						"Dequeued skb (Adr: %lx)!",
  						(unsigned long) bcs->tx_skb);
  			}
  		}
  
  		if (bcs->tx_skb) {
  			gig_dbg(DEBUG_OUTPUT, "modem_fill: tx_skb");
  			if (write_modem(cs) < 0) {
  				gig_dbg(DEBUG_OUTPUT,
  					"modem_fill: write_modem failed");
  				again = 1; /* no callback will be called! */
  			}
  		}
  	} while (again);
  }
  
  /*
   * Interrupt Input URB completion routine
   */
  static void gigaset_read_int_callback(struct urb *urb)
  {
  	struct cardstate *cs = urb->context;
  	struct inbuf_t *inbuf = cs->inbuf;
  	int status = urb->status;
  	int r;
  	unsigned numbytes;
  	unsigned char *src;
  	unsigned long flags;
  
  	if (!status) {
  		numbytes = urb->actual_length;
  
  		if (numbytes) {
  			src = cs->hw.usb->rcvbuf;
  			if (unlikely(*src))
  				dev_warn(cs->dev,
  					 "%s: There was no leading 0, but 0x%02x!
  ",
  					 __func__, (unsigned) *src);
  			++src; /* skip leading 0x00 */
  			--numbytes;
  			if (gigaset_fill_inbuf(inbuf, src, numbytes)) {
  				gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
  				gigaset_schedule_event(inbuf->cs);
  			}
  		} else
  			gig_dbg(DEBUG_INTR, "Received zero block length");
  	} else {
  		/* The urb might have been killed. */
  		gig_dbg(DEBUG_ANY, "%s - nonzero status received: %d",
  			__func__, status);
  		if (status == -ENOENT || status == -ESHUTDOWN)
  			/* killed or endpoint shutdown: don't resubmit */
  			return;
  	}
  
  	/* resubmit URB */
  	spin_lock_irqsave(&cs->lock, flags);
  	if (!cs->connected) {
  		spin_unlock_irqrestore(&cs->lock, flags);
  		pr_err("%s: disconnected
  ", __func__);
  		return;
  	}
  	r = usb_submit_urb(urb, GFP_ATOMIC);
  	spin_unlock_irqrestore(&cs->lock, flags);
  	if (r)
  		dev_err(cs->dev, "error %d resubmitting URB
  ", -r);
  }
  
  
  /* This callback routine is called when data was transmitted to the device. */
  static void gigaset_write_bulk_callback(struct urb *urb)
  {
  	struct cardstate *cs = urb->context;
  	int status = urb->status;
  	unsigned long flags;
  
  	switch (status) {
  	case 0:			/* normal completion */
  		break;
  	case -ENOENT:		/* killed */
  		gig_dbg(DEBUG_ANY, "%s: killed", __func__);
  		cs->hw.usb->busy = 0;
  		return;
  	default:
  		dev_err(cs->dev, "bulk transfer failed (status %d)
  ",
  			-status);
  		/* That's all we can do. Communication problems
  		   are handled by timeouts or network protocols. */
  	}
  
  	spin_lock_irqsave(&cs->lock, flags);
  	if (!cs->connected) {
  		pr_err("%s: disconnected
  ", __func__);
  	} else {
  		cs->hw.usb->busy = 0;
  		tasklet_schedule(&cs->write_tasklet);
  	}
  	spin_unlock_irqrestore(&cs->lock, flags);
  }
  
  static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb)
  {
  	struct cmdbuf_t *tcb;
  	unsigned long flags;
  	int count;
  	int status = -ENOENT;
  	struct usb_cardstate *ucs = cs->hw.usb;
  
  	do {
  		if (!cb->len) {
  			tcb = cb;
  
  			spin_lock_irqsave(&cs->cmdlock, flags);
  			cs->cmdbytes -= cs->curlen;
  			gig_dbg(DEBUG_OUTPUT, "send_cb: sent %u bytes, %u left",
  				cs->curlen, cs->cmdbytes);
  			cs->cmdbuf = cb = cb->next;
  			if (cb) {
  				cb->prev = NULL;
  				cs->curlen = cb->len;
  			} else {
  				cs->lastcmdbuf = NULL;
  				cs->curlen = 0;
  			}
  			spin_unlock_irqrestore(&cs->cmdlock, flags);
  
  			if (tcb->wake_tasklet)
  				tasklet_schedule(tcb->wake_tasklet);
  			kfree(tcb);
  		}
  		if (cb) {
  			count = min(cb->len, ucs->bulk_out_size);
  			gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count);
  
  			usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
  					  usb_sndbulkpipe(ucs->udev,
  							  ucs->bulk_out_endpointAddr & 0x0f),
  					  cb->buf + cb->offset, count,
  					  gigaset_write_bulk_callback, cs);
  
  			cb->offset += count;
  			cb->len -= count;
  			ucs->busy = 1;
  
  			spin_lock_irqsave(&cs->lock, flags);
  			status = cs->connected ?
  				usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC) :
  				-ENODEV;
  			spin_unlock_irqrestore(&cs->lock, flags);
  
  			if (status) {
  				ucs->busy = 0;
  				dev_err(cs->dev,
  					"could not submit urb (error %d)
  ",
  					-status);
  				cb->len = 0; /* skip urb => remove cb+wakeup
  						in next loop cycle */
  			}
  		}
  	} while (cb && status); /* next command on error */
  
  	return status;
  }
  
  /* Send command to device. */
  static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
  {
  	unsigned long flags;
  
  	gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
  			   DEBUG_TRANSCMD : DEBUG_LOCKCMD,
  			   "CMD Transmit", cb->len, cb->buf);
  
  	spin_lock_irqsave(&cs->cmdlock, flags);
  	cb->prev = cs->lastcmdbuf;
  	if (cs->lastcmdbuf)
  		cs->lastcmdbuf->next = cb;
  	else {
  		cs->cmdbuf = cb;
  		cs->curlen = cb->len;
  	}
  	cs->cmdbytes += cb->len;
  	cs->lastcmdbuf = cb;
  	spin_unlock_irqrestore(&cs->cmdlock, flags);
  
  	spin_lock_irqsave(&cs->lock, flags);
  	if (cs->connected)
  		tasklet_schedule(&cs->write_tasklet);
  	spin_unlock_irqrestore(&cs->lock, flags);
  	return cb->len;
  }
  
  static int gigaset_write_room(struct cardstate *cs)
  {
  	unsigned bytes;
  
  	bytes = cs->cmdbytes;
  	return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
  }
  
  static int gigaset_chars_in_buffer(struct cardstate *cs)
  {
  	return cs->cmdbytes;
  }
  
  /*
   * set the break characters on the internal serial adapter
   * using undocumented device commands reverse engineered from USB traces
   * of the Siemens Windows driver
   */
  static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
  {
  	struct usb_device *udev = cs->hw.usb->udev;
  
  	gigaset_dbg_buffer(DEBUG_USBREQ, "brkchars", 6, buf);
  	memcpy(cs->hw.usb->bchars, buf, 6);
  	return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
  			       0, 0, &buf, 6, 2000);
  }
  
  static void gigaset_freebcshw(struct bc_state *bcs)
  {
  	/* unused */
  }
  
  /* Initialize the b-channel structure */
  static int gigaset_initbcshw(struct bc_state *bcs)
  {
  	/* unused */
  	bcs->hw.usb = NULL;
  	return 0;
  }
  
  static void gigaset_reinitbcshw(struct bc_state *bcs)
  {
  	/* nothing to do for M10x */
  }
  
  static void gigaset_freecshw(struct cardstate *cs)
  {
  	tasklet_kill(&cs->write_tasklet);
  	kfree(cs->hw.usb);
  }
  
  static int gigaset_initcshw(struct cardstate *cs)
  {
  	struct usb_cardstate *ucs;
  
  	cs->hw.usb = ucs =
  		kmalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
  	if (!ucs) {
  		pr_err("out of memory
  ");
  		return -ENOMEM;
  	}
  
  	ucs->bchars[0] = 0;
  	ucs->bchars[1] = 0;
  	ucs->bchars[2] = 0;
  	ucs->bchars[3] = 0;
  	ucs->bchars[4] = 0x11;
  	ucs->bchars[5] = 0x13;
  	ucs->bulk_out_buffer = NULL;
  	ucs->bulk_out_urb = NULL;
  	ucs->read_urb = NULL;
  	tasklet_init(&cs->write_tasklet,
  		     gigaset_modem_fill, (unsigned long) cs);
  
  	return 0;
  }
  
  /* Send data from current skb to the device. */
  static int write_modem(struct cardstate *cs)
  {
  	int ret = 0;
  	int count;
  	struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
  	struct usb_cardstate *ucs = cs->hw.usb;
  	unsigned long flags;
  
  	gig_dbg(DEBUG_OUTPUT, "len: %d...", bcs->tx_skb->len);
  
  	if (!bcs->tx_skb->len) {
  		dev_kfree_skb_any(bcs->tx_skb);
  		bcs->tx_skb = NULL;
  		return -EINVAL;
  	}
  
  	/* Copy data to bulk out buffer and transmit data */
  	count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size);
  	skb_copy_from_linear_data(bcs->tx_skb, ucs->bulk_out_buffer, count);
  	skb_pull(bcs->tx_skb, count);
  	ucs->busy = 1;
  	gig_dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count);
  
  	spin_lock_irqsave(&cs->lock, flags);
  	if (cs->connected) {
  		usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
  				  usb_sndbulkpipe(ucs->udev,
  						  ucs->bulk_out_endpointAddr &
  						  0x0f),
  				  ucs->bulk_out_buffer, count,
  				  gigaset_write_bulk_callback, cs);
  		ret = usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC);
  	} else {
  		ret = -ENODEV;
  	}
  	spin_unlock_irqrestore(&cs->lock, flags);
  
  	if (ret) {
  		dev_err(cs->dev, "could not submit urb (error %d)
  ", -ret);
  		ucs->busy = 0;
  	}
  
  	if (!bcs->tx_skb->len) {
  		/* skb sent completely */
  		gigaset_skb_sent(bcs, bcs->tx_skb);
  
  		gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
  			(unsigned long) bcs->tx_skb);
  		dev_kfree_skb_any(bcs->tx_skb);
  		bcs->tx_skb = NULL;
  	}
  
  	return ret;
  }
  
  static int gigaset_probe(struct usb_interface *interface,
  			 const struct usb_device_id *id)
  {
  	int retval;
  	struct usb_device *udev = interface_to_usbdev(interface);
  	struct usb_host_interface *hostif = interface->cur_altsetting;
  	struct cardstate *cs = NULL;
  	struct usb_cardstate *ucs = NULL;
  	struct usb_endpoint_descriptor *endpoint;
  	int buffer_size;
  
  	gig_dbg(DEBUG_ANY, "%s: Check if device matches ...", __func__);
  
  	/* See if the device offered us matches what we can accept */
  	if ((le16_to_cpu(udev->descriptor.idVendor)  != USB_M105_VENDOR_ID) ||
  	    (le16_to_cpu(udev->descriptor.idProduct) != USB_M105_PRODUCT_ID)) {
  		gig_dbg(DEBUG_ANY, "device ID (0x%x, 0x%x) not for me - skip",
  			le16_to_cpu(udev->descriptor.idVendor),
  			le16_to_cpu(udev->descriptor.idProduct));
  		return -ENODEV;
  	}
  	if (hostif->desc.bInterfaceNumber != 0) {
  		gig_dbg(DEBUG_ANY, "interface %d not for me - skip",
  			hostif->desc.bInterfaceNumber);
  		return -ENODEV;
  	}
  	if (hostif->desc.bAlternateSetting != 0) {
  		dev_notice(&udev->dev, "unsupported altsetting %d - skip",
  			   hostif->desc.bAlternateSetting);
  		return -ENODEV;
  	}
  	if (hostif->desc.bInterfaceClass != 255) {
  		dev_notice(&udev->dev, "unsupported interface class %d - skip",
  			   hostif->desc.bInterfaceClass);
  		return -ENODEV;
  	}
  
  	dev_info(&udev->dev, "%s: Device matched ... !
  ", __func__);
  
  	/* allocate memory for our device state and initialize it */
  	cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
  	if (!cs)
  		return -ENODEV;
  	ucs = cs->hw.usb;
  
  	/* save off device structure ptrs for later use */
  	usb_get_dev(udev);
  	ucs->udev = udev;
  	ucs->interface = interface;
  	cs->dev = &interface->dev;
  
  	/* save address of controller structure */
  	usb_set_intfdata(interface, cs);
  
  	endpoint = &hostif->endpoint[0].desc;
  
  	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
  	ucs->bulk_out_size = buffer_size;
  	ucs->bulk_out_endpointAddr = endpoint->bEndpointAddress;
  	ucs->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
  	if (!ucs->bulk_out_buffer) {
  		dev_err(cs->dev, "Couldn't allocate bulk_out_buffer
  ");
  		retval = -ENOMEM;
  		goto error;
  	}
  
  	ucs->bulk_out_urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!ucs->bulk_out_urb) {
  		dev_err(cs->dev, "Couldn't allocate bulk_out_urb
  ");
  		retval = -ENOMEM;
  		goto error;
  	}
  
  	endpoint = &hostif->endpoint[1].desc;
  
  	ucs->busy = 0;
  
  	ucs->read_urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!ucs->read_urb) {
  		dev_err(cs->dev, "No free urbs available
  ");
  		retval = -ENOMEM;
  		goto error;
  	}
  	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
  	ucs->rcvbuf_size = buffer_size;
  	ucs->int_in_endpointAddr = endpoint->bEndpointAddress;
  	ucs->rcvbuf = kmalloc(buffer_size, GFP_KERNEL);
  	if (!ucs->rcvbuf) {
  		dev_err(cs->dev, "Couldn't allocate rcvbuf
  ");
  		retval = -ENOMEM;
  		goto error;
  	}
  	/* Fill the interrupt urb and send it to the core */
  	usb_fill_int_urb(ucs->read_urb, udev,
  			 usb_rcvintpipe(udev,
  					endpoint->bEndpointAddress & 0x0f),
  			 ucs->rcvbuf, buffer_size,
  			 gigaset_read_int_callback,
  			 cs, endpoint->bInterval);
  
  	retval = usb_submit_urb(ucs->read_urb, GFP_KERNEL);
  	if (retval) {
  		dev_err(cs->dev, "Could not submit URB (error %d)
  ", -retval);
  		goto error;
  	}
  
  	/* tell common part that the device is ready */
  	if (startmode == SM_LOCKED)
  		cs->mstate = MS_LOCKED;
  
  	retval = gigaset_start(cs);
  	if (retval < 0) {
  		tasklet_kill(&cs->write_tasklet);
  		goto error;
  	}
  	return 0;
  
  error:
  	usb_kill_urb(ucs->read_urb);
  	kfree(ucs->bulk_out_buffer);
  	usb_free_urb(ucs->bulk_out_urb);
  	kfree(ucs->rcvbuf);
  	usb_free_urb(ucs->read_urb);
  	usb_set_intfdata(interface, NULL);
  	ucs->read_urb = ucs->bulk_out_urb = NULL;
  	ucs->rcvbuf = ucs->bulk_out_buffer = NULL;
  	usb_put_dev(ucs->udev);
  	ucs->udev = NULL;
  	ucs->interface = NULL;
  	gigaset_freecs(cs);
  	return retval;
  }
  
  static void gigaset_disconnect(struct usb_interface *interface)
  {
  	struct cardstate *cs;
  	struct usb_cardstate *ucs;
  
  	cs = usb_get_intfdata(interface);
  	ucs = cs->hw.usb;
  
  	dev_info(cs->dev, "disconnecting Gigaset USB adapter
  ");
  
  	usb_kill_urb(ucs->read_urb);
  
  	gigaset_stop(cs);
  
  	usb_set_intfdata(interface, NULL);
  	tasklet_kill(&cs->write_tasklet);
  
  	usb_kill_urb(ucs->bulk_out_urb);
  
  	kfree(ucs->bulk_out_buffer);
  	usb_free_urb(ucs->bulk_out_urb);
  	kfree(ucs->rcvbuf);
  	usb_free_urb(ucs->read_urb);
  	ucs->read_urb = ucs->bulk_out_urb = NULL;
  	ucs->rcvbuf = ucs->bulk_out_buffer = NULL;
  
  	usb_put_dev(ucs->udev);
  	ucs->interface = NULL;
  	ucs->udev = NULL;
  	cs->dev = NULL;
  	gigaset_freecs(cs);
  }
  
  /* gigaset_suspend
   * This function is called before the USB connection is suspended or reset.
   */
  static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
  {
  	struct cardstate *cs = usb_get_intfdata(intf);
  
  	/* stop activity */
  	cs->connected = 0;	/* prevent rescheduling */
  	usb_kill_urb(cs->hw.usb->read_urb);
  	tasklet_kill(&cs->write_tasklet);
  	usb_kill_urb(cs->hw.usb->bulk_out_urb);
  
  	gig_dbg(DEBUG_SUSPEND, "suspend complete");
  	return 0;
  }
  
  /* gigaset_resume
   * This function is called after the USB connection has been resumed or reset.
   */
  static int gigaset_resume(struct usb_interface *intf)
  {
  	struct cardstate *cs = usb_get_intfdata(intf);
  	int rc;
  
  	/* resubmit interrupt URB */
  	cs->connected = 1;
  	rc = usb_submit_urb(cs->hw.usb->read_urb, GFP_KERNEL);
  	if (rc) {
  		dev_err(cs->dev, "Could not submit read URB (error %d)
  ", -rc);
  		return rc;
  	}
  
  	gig_dbg(DEBUG_SUSPEND, "resume complete");
  	return 0;
  }
  
  /* gigaset_pre_reset
   * This function is called before the USB connection is reset.
   */
  static int gigaset_pre_reset(struct usb_interface *intf)
  {
  	/* same as suspend */
  	return gigaset_suspend(intf, PMSG_ON);
  }
  
  static const struct gigaset_ops ops = {
  	gigaset_write_cmd,
  	gigaset_write_room,
  	gigaset_chars_in_buffer,
  	gigaset_brkchars,
  	gigaset_init_bchannel,
  	gigaset_close_bchannel,
  	gigaset_initbcshw,
  	gigaset_freebcshw,
  	gigaset_reinitbcshw,
  	gigaset_initcshw,
  	gigaset_freecshw,
  	gigaset_set_modem_ctrl,
  	gigaset_baud_rate,
  	gigaset_set_line_ctrl,
  	gigaset_m10x_send_skb,
  	gigaset_m10x_input,
  };
  
  /*
   * This function is called while kernel-module is loaded
   */
  static int __init usb_gigaset_init(void)
  {
  	int result;
  
  	/* allocate memory for our driver state and initialize it */
  	driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
  				    GIGASET_MODULENAME, GIGASET_DEVNAME,
  				    &ops, THIS_MODULE);
  	if (driver == NULL) {
  		result = -ENOMEM;
  		goto error;
  	}
  
  	/* register this driver with the USB subsystem */
  	result = usb_register(&gigaset_usb_driver);
  	if (result < 0) {
  		pr_err("error %d registering USB driver
  ", -result);
  		goto error;
  	}
  
  	pr_info(DRIVER_DESC "
  ");
  	return 0;
  
  error:
  	if (driver)
  		gigaset_freedriver(driver);
  	driver = NULL;
  	return result;
  }
  
  /*
   * This function is called while unloading the kernel-module
   */
  static void __exit usb_gigaset_exit(void)
  {
  	int i;
  
  	gigaset_blockdriver(driver); /* => probe will fail
  				      * => no gigaset_start any more
  				      */
  
  	/* stop all connected devices */
  	for (i = 0; i < driver->minors; i++)
  		gigaset_shutdown(driver->cs + i);
  
  	/* from now on, no isdn callback should be possible */
  
  	/* deregister this driver with the USB subsystem */
  	usb_deregister(&gigaset_usb_driver);
  	/* this will call the disconnect-callback */
  	/* from now on, no disconnect/probe callback should be running */
  
  	gigaset_freedriver(driver);
  	driver = NULL;
  }
  
  
  module_init(usb_gigaset_init);
  module_exit(usb_gigaset_exit);
  
  MODULE_AUTHOR(DRIVER_AUTHOR);
  MODULE_DESCRIPTION(DRIVER_DESC);
  
  MODULE_LICENSE("GPL");