bas-gigaset.c 68.6 KB
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/*
 * USB driver for Gigaset 307x base via direct USB connection.
 *
 * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
 *                       Tilman Schmidt <tilman@imap.cc>,
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 *                       Stefan Eilers.
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 *
 * =====================================================================
 *	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/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/usb.h>
#include <linux/module.h>
#include <linux/moduleparam.h>

/* Version Information */
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#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
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#define DRIVER_DESC "USB Driver for Gigaset 307x"


/* 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      16
#define GIGASET_MODULENAME "bas_gigaset"
#define GIGASET_DEVNAME    "ttyGB"

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/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
#define IF_WRITEBUF 264
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/* interrupt pipe message size according to ibid. ch. 2.2 */
#define IP_MSGSIZE 3

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/* Values for the Gigaset 307x */
#define USB_GIGA_VENDOR_ID      0x0681
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#define USB_3070_PRODUCT_ID     0x0001
#define USB_3075_PRODUCT_ID     0x0002
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#define USB_SX303_PRODUCT_ID    0x0021
#define USB_SX353_PRODUCT_ID    0x0022

/* table of devices that work with this driver */
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static const struct usb_device_id gigaset_table [] = {
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	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
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	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
	{ } /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, gigaset_table);

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/*======================= local function prototypes ==========================*/
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/* function called if a new device belonging to this driver is connected */
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static int gigaset_probe(struct usb_interface *interface,
			 const struct usb_device_id *id);

/* Function will be called if the device is unplugged */
static void gigaset_disconnect(struct usb_interface *interface);

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/* 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);

/* functions called before/after device reset */
static int gigaset_pre_reset(struct usb_interface *intf);
static int gigaset_post_reset(struct usb_interface *intf);

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static int atread_submit(struct cardstate *, int);
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static void stopurbs(struct bas_bc_state *);
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static int req_submit(struct bc_state *, int, int, int);
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static int atwrite_submit(struct cardstate *, unsigned char *, int);
static int start_cbsend(struct cardstate *);
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/*============================================================================*/
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struct bas_cardstate {
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	struct usb_device	*udev;		/* USB device pointer */
	struct usb_interface	*interface;	/* interface for this device */
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	unsigned char		minor;		/* starting minor number */

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	struct urb		*urb_ctrl;	/* control pipe default URB */
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	struct usb_ctrlrequest	dr_ctrl;
	struct timer_list	timer_ctrl;	/* control request timeout */
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	int			retry_ctrl;
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	struct timer_list	timer_atrdy;	/* AT command ready timeout */
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	struct urb		*urb_cmd_out;	/* for sending AT commands */
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	struct usb_ctrlrequest	dr_cmd_out;
	int			retry_cmd_out;

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	struct urb		*urb_cmd_in;	/* for receiving AT replies */
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	struct usb_ctrlrequest	dr_cmd_in;
	struct timer_list	timer_cmd_in;	/* receive request timeout */
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	unsigned char		*rcvbuf;	/* AT reply receive buffer */
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	struct urb		*urb_int_in;	/* URB for interrupt pipe */
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	unsigned char		*int_in_buf;
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	spinlock_t		lock;		/* locks all following */
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	int			basstate;	/* bitmap (BS_*) */
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	int			pending;	/* uncompleted base request */
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	wait_queue_head_t	waitqueue;
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	int			rcvbuf_size;	/* size of AT receive buffer */
						/* 0: no receive in progress */
	int			retry_cmd_in;	/* receive req retry count */
};

/* status of direct USB connection to 307x base (bits in basstate) */
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#define BS_ATOPEN	0x001	/* AT channel open */
#define BS_B1OPEN	0x002	/* B channel 1 open */
#define BS_B2OPEN	0x004	/* B channel 2 open */
#define BS_ATREADY	0x008	/* base ready for AT command */
#define BS_INIT		0x010	/* base has signalled INIT_OK */
#define BS_ATTIMER	0x020	/* waiting for HD_READY_SEND_ATDATA */
#define BS_ATRDPEND	0x040	/* urb_cmd_in in use */
#define BS_ATWRPEND	0x080	/* urb_cmd_out in use */
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#define BS_SUSPEND	0x100	/* USB port suspended */
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static struct gigaset_driver *driver = NULL;

/* 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,
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	.suspend =	gigaset_suspend,
	.resume =	gigaset_resume,
	.reset_resume =	gigaset_post_reset,
	.pre_reset =	gigaset_pre_reset,
	.post_reset =	gigaset_post_reset,
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};

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/* get message text for usb_submit_urb return code
 */
static char *get_usb_rcmsg(int rc)
{
	static char unkmsg[28];

	switch (rc) {
	case 0:
		return "success";
	case -ENOMEM:
		return "out of memory";
	case -ENODEV:
		return "device not present";
	case -ENOENT:
		return "endpoint not present";
	case -ENXIO:
		return "URB type not supported";
	case -EINVAL:
		return "invalid argument";
	case -EAGAIN:
		return "start frame too early or too much scheduled";
	case -EFBIG:
		return "too many isochronous frames requested";
	case -EPIPE:
		return "endpoint stalled";
	case -EMSGSIZE:
		return "invalid packet size";
	case -ENOSPC:
		return "would overcommit USB bandwidth";
	case -ESHUTDOWN:
		return "device shut down";
	case -EPERM:
		return "reject flag set";
	case -EHOSTUNREACH:
		return "device suspended";
	default:
		snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
		return unkmsg;
	}
}

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/* get message text for USB status code
 */
static char *get_usb_statmsg(int status)
{
	static char unkmsg[28];

	switch (status) {
	case 0:
		return "success";
	case -ENOENT:
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		return "unlinked (sync)";
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	case -EINPROGRESS:
		return "pending";
	case -EPROTO:
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		return "bit stuffing error, timeout, or unknown USB error";
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	case -EILSEQ:
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		return "CRC mismatch, timeout, or unknown USB error";
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	case -ETIME:
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		return "timed out";
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	case -EPIPE:
		return "endpoint stalled";
	case -ECOMM:
		return "IN buffer overrun";
	case -ENOSR:
		return "OUT buffer underrun";
	case -EOVERFLOW:
		return "too much data";
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	case -EREMOTEIO:
		return "short packet detected";
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	case -ENODEV:
		return "device removed";
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	case -EXDEV:
		return "partial isochronous transfer";
	case -EINVAL:
		return "invalid argument";
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	case -ECONNRESET:
		return "unlinked (async)";
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	case -ESHUTDOWN:
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		return "device shut down";
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	default:
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		snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
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		return unkmsg;
	}
}

/* usb_pipetype_str
 * retrieve string representation of USB pipe type
 */
static inline char *usb_pipetype_str(int pipe)
{
	if (usb_pipeisoc(pipe))
		return "Isoc";
	if (usb_pipeint(pipe))
		return "Int";
	if (usb_pipecontrol(pipe))
		return "Ctrl";
	if (usb_pipebulk(pipe))
		return "Bulk";
	return "?";
}

/* dump_urb
 * write content of URB to syslog for debugging
 */
static inline void dump_urb(enum debuglevel level, const char *tag,
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			    struct urb *urb)
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{
#ifdef CONFIG_GIGASET_DEBUG
	int i;
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	gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
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	if (urb) {
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		gig_dbg(level,
			"  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
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			"hcpriv=0x%08lx, transfer_flags=0x%x,",
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			(unsigned long) urb->dev,
			usb_pipetype_str(urb->pipe),
			usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
			usb_pipein(urb->pipe) ? "in" : "out",
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			(unsigned long) urb->hcpriv,
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			urb->transfer_flags);
		gig_dbg(level,
			"  transfer_buffer=0x%08lx[%d], actual_length=%d, "
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			"setup_packet=0x%08lx,",
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			(unsigned long) urb->transfer_buffer,
			urb->transfer_buffer_length, urb->actual_length,
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			(unsigned long) urb->setup_packet);
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		gig_dbg(level,
			"  start_frame=%d, number_of_packets=%d, interval=%d, "
			"error_count=%d,",
			urb->start_frame, urb->number_of_packets, urb->interval,
			urb->error_count);
		gig_dbg(level,
			"  context=0x%08lx, complete=0x%08lx, "
			"iso_frame_desc[]={",
			(unsigned long) urb->context,
			(unsigned long) urb->complete);
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		for (i = 0; i < urb->number_of_packets; i++) {
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			struct usb_iso_packet_descriptor *pifd
				= &urb->iso_frame_desc[i];
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			gig_dbg(level,
				"    {offset=%u, length=%u, actual_length=%u, "
				"status=%u}",
				pifd->offset, pifd->length, pifd->actual_length,
				pifd->status);
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		}
	}
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	gig_dbg(level, "}}");
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#endif
}

/* read/set modem control bits etc. (m10x only) */
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
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				  unsigned new_state)
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{
	return -EINVAL;
}

static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
{
	return -EINVAL;
}

static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
{
	return -EINVAL;
}

/* error_hangup
 * hang up any existing connection because of an unrecoverable error
 * This function may be called from any context and takes care of scheduling
 * the necessary actions for execution outside of interrupt context.
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 * cs->lock must not be held.
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 * argument:
 *	B channel control structure
 */
static inline void error_hangup(struct bc_state *bcs)
{
	struct cardstate *cs = bcs->cs;

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	gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
		__func__, bcs->channel);
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	if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
		dev_err(cs->dev, "event queue full\n");
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	gigaset_schedule_event(cs);
}

/* error_reset
 * reset Gigaset device because of an unrecoverable error
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 * This function may be called from any context, and takes care of
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 * scheduling the necessary actions for execution outside of interrupt context.
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 * cs->lock must not be held.
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 * argument:
 *	controller state structure
 */
static inline void error_reset(struct cardstate *cs)
{
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	/* close AT command channel to recover (ignore errors) */
	req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);

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	//FIXME try to recover without bothering the user
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	dev_err(cs->dev,
	    "unrecoverable error - please disconnect Gigaset base to reset\n");
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}

/* check_pending
 * check for completion of pending control request
 * parameter:
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 *	ucs	hardware specific controller state structure
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 */
static void check_pending(struct bas_cardstate *ucs)
{
	unsigned long flags;

	spin_lock_irqsave(&ucs->lock, flags);
	switch (ucs->pending) {
	case 0:
		break;
	case HD_OPEN_ATCHANNEL:
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		if (ucs->basstate & BS_ATOPEN)
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			ucs->pending = 0;
		break;
	case HD_OPEN_B1CHANNEL:
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		if (ucs->basstate & BS_B1OPEN)
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			ucs->pending = 0;
		break;
	case HD_OPEN_B2CHANNEL:
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		if (ucs->basstate & BS_B2OPEN)
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			ucs->pending = 0;
		break;
	case HD_CLOSE_ATCHANNEL:
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		if (!(ucs->basstate & BS_ATOPEN))
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			ucs->pending = 0;
		break;
	case HD_CLOSE_B1CHANNEL:
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		if (!(ucs->basstate & BS_B1OPEN))
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			ucs->pending = 0;
		break;
	case HD_CLOSE_B2CHANNEL:
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		if (!(ucs->basstate & BS_B2OPEN))
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			ucs->pending = 0;
		break;
	case HD_DEVICE_INIT_ACK:		/* no reply expected */
		ucs->pending = 0;
		break;
	/* HD_READ_ATMESSAGE, HD_WRITE_ATMESSAGE, HD_RESET_INTERRUPTPIPE
	 * are handled separately and should never end up here
	 */
	default:
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		dev_warn(&ucs->interface->dev,
			 "unknown pending request 0x%02x cleared\n",
			 ucs->pending);
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		ucs->pending = 0;
	}

	if (!ucs->pending)
		del_timer(&ucs->timer_ctrl);

	spin_unlock_irqrestore(&ucs->lock, flags);
}

/* cmd_in_timeout
 * timeout routine for command input request
 * argument:
 *	controller state structure
 */
static void cmd_in_timeout(unsigned long data)
{
	struct cardstate *cs = (struct cardstate *) data;
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	struct bas_cardstate *ucs = cs->hw.bas;
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	int rc;
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	if (!ucs->rcvbuf_size) {
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		gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
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		return;
	}

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	if (ucs->retry_cmd_in++ < BAS_RETRY) {
		dev_notice(cs->dev, "control read: timeout, retry %d\n",
			   ucs->retry_cmd_in);
		rc = atread_submit(cs, BAS_TIMEOUT);
		if (rc >= 0 || rc == -ENODEV)
			/* resubmitted or disconnected */
			/* - bypass regular exit block */
			return;
	} else {
		dev_err(cs->dev,
			"control read: timeout, giving up after %d tries\n",
			ucs->retry_cmd_in);
	}
	kfree(ucs->rcvbuf);
	ucs->rcvbuf = NULL;
	ucs->rcvbuf_size = 0;
	error_reset(cs);
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}

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/* set/clear bits in base connection state, return previous state
 */
inline static int update_basstate(struct bas_cardstate *ucs,
				  int set, int clear)
{
	unsigned long flags;
	int state;
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	spin_lock_irqsave(&ucs->lock, flags);
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	state = ucs->basstate;
	ucs->basstate = (state & ~clear) | set;
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	spin_unlock_irqrestore(&ucs->lock, flags);
	return state;
}
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/* read_ctrl_callback
 * USB completion handler for control pipe input
 * called by the USB subsystem in interrupt context
 * parameter:
 *	urb	USB request block
 *		urb->context = inbuf structure for controller state
 */
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static void read_ctrl_callback(struct urb *urb)
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{
	struct inbuf_t *inbuf = urb->context;
	struct cardstate *cs = inbuf->cs;
	struct bas_cardstate *ucs = cs->hw.bas;
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	int status = urb->status;
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	int have_data = 0;
	unsigned numbytes;
	int rc;

	update_basstate(ucs, 0, BS_ATRDPEND);
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	wake_up(&ucs->waitqueue);
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	if (!ucs->rcvbuf_size) {
		dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
		return;
	}

	del_timer(&ucs->timer_cmd_in);

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	switch (status) {
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	case 0:				/* normal completion */
		numbytes = urb->actual_length;
		if (unlikely(numbytes != ucs->rcvbuf_size)) {
			dev_warn(cs->dev,
			       "control read: received %d chars, expected %d\n",
				 numbytes, ucs->rcvbuf_size);
			if (numbytes > ucs->rcvbuf_size)
				numbytes = ucs->rcvbuf_size;
		}

		/* copy received bytes to inbuf */
		have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);

		if (unlikely(numbytes < ucs->rcvbuf_size)) {
			/* incomplete - resubmit for remaining bytes */
			ucs->rcvbuf_size -= numbytes;
			ucs->retry_cmd_in = 0;
			rc = atread_submit(cs, BAS_TIMEOUT);
			if (rc >= 0 || rc == -ENODEV)
				/* resubmitted or disconnected */
				/* - bypass regular exit block */
				return;
			error_reset(cs);
		}
		break;

	case -ENOENT:			/* cancelled */
	case -ECONNRESET:		/* cancelled (async) */
	case -EINPROGRESS:		/* pending */
	case -ENODEV:			/* device removed */
	case -ESHUTDOWN:		/* device shut down */
		/* no action necessary */
		gig_dbg(DEBUG_USBREQ, "%s: %s",
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			__func__, get_usb_statmsg(status));
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		break;

	default:			/* severe trouble */
		dev_warn(cs->dev, "control read: %s\n",
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			 get_usb_statmsg(status));
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		if (ucs->retry_cmd_in++ < BAS_RETRY) {
			dev_notice(cs->dev, "control read: retry %d\n",
				   ucs->retry_cmd_in);
			rc = atread_submit(cs, BAS_TIMEOUT);
			if (rc >= 0 || rc == -ENODEV)
				/* resubmitted or disconnected */
				/* - bypass regular exit block */
				return;
		} else {
			dev_err(cs->dev,
				"control read: giving up after %d tries\n",
				ucs->retry_cmd_in);
		}
		error_reset(cs);
	}

	kfree(ucs->rcvbuf);
	ucs->rcvbuf = NULL;
	ucs->rcvbuf_size = 0;
	if (have_data) {
		gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
		gigaset_schedule_event(cs);
	}
}

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/* atread_submit
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 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
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 * parameters:
 *	cs	controller state structure
 *	timeout	timeout in 1/10 sec., 0: none
 * return value:
 *	0 on success
 *	-EBUSY if another request is pending
 *	any URB submission error code
 */
static int atread_submit(struct cardstate *cs, int timeout)
{
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	struct bas_cardstate *ucs = cs->hw.bas;
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	int basstate;
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	int ret;

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	gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
		ucs->rcvbuf_size);
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	basstate = update_basstate(ucs, BS_ATRDPEND, 0);
	if (basstate & BS_ATRDPEND) {
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		dev_err(cs->dev,
			"could not submit HD_READ_ATMESSAGE: URB busy\n");
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		return -EBUSY;
	}

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	if (basstate & BS_SUSPEND) {
		dev_notice(cs->dev,
			   "HD_READ_ATMESSAGE not submitted, "
			   "suspend in progress\n");
		update_basstate(ucs, 0, BS_ATRDPEND);
		/* treat like disconnect */
		return -ENODEV;
	}

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	ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
	ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
	ucs->dr_cmd_in.wValue = 0;
	ucs->dr_cmd_in.wIndex = 0;
	ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
	usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
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			     usb_rcvctrlpipe(ucs->udev, 0),
			     (unsigned char*) & ucs->dr_cmd_in,
			     ucs->rcvbuf, ucs->rcvbuf_size,
			     read_ctrl_callback, cs->inbuf);
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	if ((ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC)) != 0) {
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		update_basstate(ucs, 0, BS_ATRDPEND);
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		dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
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			get_usb_rcmsg(ret));
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		return ret;
	}

	if (timeout > 0) {
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		gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
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		ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
		ucs->timer_cmd_in.data = (unsigned long) cs;
		ucs->timer_cmd_in.function = cmd_in_timeout;
		add_timer(&ucs->timer_cmd_in);
	}
	return 0;
}

/* read_int_callback
 * USB completion handler for interrupt pipe input
 * called by the USB subsystem in interrupt context
 * parameter:
 *	urb	USB request block
 *		urb->context = controller state structure
 */
629
static void read_int_callback(struct urb *urb)
630
{
631 632
	struct cardstate *cs = urb->context;
	struct bas_cardstate *ucs = cs->hw.bas;
633
	struct bc_state *bcs;
634
	int status = urb->status;
635
	unsigned long flags;
636
	int rc;
637 638 639
	unsigned l;
	int channel;

640
	switch (status) {
641 642
	case 0:			/* success */
		break;
643 644
	case -ENOENT:			/* cancelled */
	case -ECONNRESET:		/* cancelled (async) */
645 646
	case -EINPROGRESS:		/* pending */
		/* ignore silently */
647
		gig_dbg(DEBUG_USBREQ, "%s: %s",
648
			__func__, get_usb_statmsg(status));
649
		return;
650 651 652 653 654
	case -ENODEV:			/* device removed */
	case -ESHUTDOWN:		/* device shut down */
		//FIXME use this as disconnect indicator?
		gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
		return;
655
	default:		/* severe trouble */
656
		dev_warn(cs->dev, "interrupt read: %s\n",
657
			 get_usb_statmsg(status));
658 659 660 661
		//FIXME corrective action? resubmission always ok?
		goto resubmit;
	}

662
	/* drop incomplete packets even if the missing bytes wouldn't matter */
663
	if (unlikely(urb->actual_length < IP_MSGSIZE)) {
664 665 666 667 668
		dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
			 urb->actual_length);
		goto resubmit;
	}

669 670 671
	l = (unsigned) ucs->int_in_buf[1] +
	    (((unsigned) ucs->int_in_buf[2]) << 8);

672 673 674
	gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
		urb->actual_length, (int)ucs->int_in_buf[0], l,
		(int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719

	channel = 0;

	switch (ucs->int_in_buf[0]) {
	case HD_DEVICE_INIT_OK:
		update_basstate(ucs, BS_INIT, 0);
		break;

	case HD_READY_SEND_ATDATA:
		del_timer(&ucs->timer_atrdy);
		update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
		start_cbsend(cs);
		break;

	case HD_OPEN_B2CHANNEL_ACK:
		++channel;
	case HD_OPEN_B1CHANNEL_ACK:
		bcs = cs->bcs + channel;
		update_basstate(ucs, BS_B1OPEN << channel, 0);
		gigaset_bchannel_up(bcs);
		break;

	case HD_OPEN_ATCHANNEL_ACK:
		update_basstate(ucs, BS_ATOPEN, 0);
		start_cbsend(cs);
		break;

	case HD_CLOSE_B2CHANNEL_ACK:
		++channel;
	case HD_CLOSE_B1CHANNEL_ACK:
		bcs = cs->bcs + channel;
		update_basstate(ucs, 0, BS_B1OPEN << channel);
		stopurbs(bcs->hw.bas);
		gigaset_bchannel_down(bcs);
		break;

	case HD_CLOSE_ATCHANNEL_ACK:
		update_basstate(ucs, 0, BS_ATOPEN);
		break;

	case HD_B2_FLOW_CONTROL:
		++channel;
	case HD_B1_FLOW_CONTROL:
		bcs = cs->bcs + channel;
		atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
720 721 722 723 724
			   &bcs->hw.bas->corrbytes);
		gig_dbg(DEBUG_ISO,
			"Flow control (channel %d, sub %d): 0x%02x => %d",
			channel, bcs->hw.bas->numsub, l,
			atomic_read(&bcs->hw.bas->corrbytes));
725 726 727 728
		break;

	case HD_RECEIVEATDATA_ACK:	/* AT response ready to be received */
		if (!l) {
729 730
			dev_warn(cs->dev,
				"HD_RECEIVEATDATA_ACK with length 0 ignored\n");
731 732 733 734
			break;
		}
		spin_lock_irqsave(&cs->lock, flags);
		if (ucs->rcvbuf_size) {
735
			/* throw away previous buffer - we have no queue */
736
			dev_err(cs->dev,
737 738 739 740
				"receive AT data overrun, %d bytes lost\n",
				ucs->rcvbuf_size);
			kfree(ucs->rcvbuf);
			ucs->rcvbuf_size = 0;
741 742 743
		}
		if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
			spin_unlock_irqrestore(&cs->lock, flags);
744 745
			dev_err(cs->dev, "out of memory receiving AT data\n");
			error_reset(cs);
746 747 748 749
			break;
		}
		ucs->rcvbuf_size = l;
		ucs->retry_cmd_in = 0;
750
		if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {
751 752 753
			kfree(ucs->rcvbuf);
			ucs->rcvbuf = NULL;
			ucs->rcvbuf_size = 0;
754
			if (rc != -ENODEV) {
755
				//FIXME corrective action?
756
				spin_unlock_irqrestore(&cs->lock, flags);
757
				error_reset(cs);
758 759
				break;
			}
760 761 762 763 764
		}
		spin_unlock_irqrestore(&cs->lock, flags);
		break;

	case HD_RESET_INTERRUPT_PIPE_ACK:
765
		gig_dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
766 767 768
		break;

	case HD_SUSPEND_END:
769
		gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
770 771 772
		break;

	default:
773 774 775
		dev_warn(cs->dev,
			 "unknown Gigaset signal 0x%02x (%u) ignored\n",
			 (int) ucs->int_in_buf[0], l);
776 777 778
	}

	check_pending(ucs);
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779
	wake_up(&ucs->waitqueue);
780 781

resubmit:
782
	rc = usb_submit_urb(urb, GFP_ATOMIC);
783
	if (unlikely(rc != 0 && rc != -ENODEV)) {
784
		dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
785
			get_usb_rcmsg(rc));
786 787 788 789 790 791 792 793 794 795 796
		error_reset(cs);
	}
}

/* read_iso_callback
 * USB completion handler for B channel isochronous input
 * called by the USB subsystem in interrupt context
 * parameter:
 *	urb	USB request block of completed request
 *		urb->context = bc_state structure
 */
797
static void read_iso_callback(struct urb *urb)
798 799 800
{
	struct bc_state *bcs;
	struct bas_bc_state *ubc;
801
	int status = urb->status;
802 803 804 805
	unsigned long flags;
	int i, rc;

	/* status codes not worth bothering the tasklet with */
806 807 808 809 810
	if (unlikely(status == -ENOENT ||
		     status == -ECONNRESET ||
		     status == -EINPROGRESS ||
		     status == -ENODEV ||
		     status == -ESHUTDOWN)) {
811
		gig_dbg(DEBUG_ISO, "%s: %s",
812
			__func__, get_usb_statmsg(status));
813 814 815
		return;
	}

816
	bcs = urb->context;
817 818 819 820 821 822
	ubc = bcs->hw.bas;

	spin_lock_irqsave(&ubc->isoinlock, flags);
	if (likely(ubc->isoindone == NULL)) {
		/* pass URB to tasklet */
		ubc->isoindone = urb;
823
		ubc->isoinstatus = status;
824
		tasklet_hi_schedule(&ubc->rcvd_tasklet);
825 826
	} else {
		/* tasklet still busy, drop data and resubmit URB */
827
		ubc->loststatus = status;
828 829 830
		for (i = 0; i < BAS_NUMFRAMES; i++) {
			ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
			if (unlikely(urb->iso_frame_desc[i].status != 0 &&
831 832
				     urb->iso_frame_desc[i].status !=
								-EINPROGRESS))
833 834 835 836
				ubc->loststatus = urb->iso_frame_desc[i].status;
			urb->iso_frame_desc[i].status = 0;
			urb->iso_frame_desc[i].actual_length = 0;
		}
T
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837
		if (likely(ubc->running)) {
838 839
			/* urb->dev is clobbered by USB subsystem */
			urb->dev = bcs->cs->hw.bas->udev;
840 841
			urb->transfer_flags = URB_ISO_ASAP;
			urb->number_of_packets = BAS_NUMFRAMES;
842 843
			gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
				__func__);
844
			rc = usb_submit_urb(urb, GFP_ATOMIC);
845
			if (unlikely(rc != 0 && rc != -ENODEV)) {
846 847
				dev_err(bcs->cs->dev,
					"could not resubmit isochronous read "
848
					"URB: %s\n", get_usb_rcmsg(rc));
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863
				dump_urb(DEBUG_ISO, "isoc read", urb);
				error_hangup(bcs);
			}
		}
	}
	spin_unlock_irqrestore(&ubc->isoinlock, flags);
}

/* write_iso_callback
 * USB completion handler for B channel isochronous output
 * called by the USB subsystem in interrupt context
 * parameter:
 *	urb	USB request block of completed request
 *		urb->context = isow_urbctx_t structure
 */
864
static void write_iso_callback(struct urb *urb)
865 866 867
{
	struct isow_urbctx_t *ucx;
	struct bas_bc_state *ubc;
868
	int status = urb->status;
869 870 871
	unsigned long flags;

	/* status codes not worth bothering the tasklet with */
872 873 874 875 876
	if (unlikely(status == -ENOENT ||
		     status == -ECONNRESET ||
		     status == -EINPROGRESS ||
		     status == -ENODEV ||
		     status == -ESHUTDOWN)) {
877
		gig_dbg(DEBUG_ISO, "%s: %s",
878
			__func__, get_usb_statmsg(status));
879 880 881 882
		return;
	}

	/* pass URB context to tasklet */
883
	ucx = urb->context;
884
	ubc = ucx->bcs->hw.bas;
885
	ucx->status = status;
886 887 888 889 890

	spin_lock_irqsave(&ubc->isooutlock, flags);
	ubc->isooutovfl = ubc->isooutdone;
	ubc->isooutdone = ucx;
	spin_unlock_irqrestore(&ubc->isooutlock, flags);
891
	tasklet_hi_schedule(&ubc->sent_tasklet);
892 893 894 895 896 897 898 899 900 901 902 903
}

/* starturbs
 * prepare and submit USB request blocks for isochronous input and output
 * argument:
 *	B channel control structure
 * return value:
 *	0 on success
 *	< 0 on error (no URBs submitted)
 */
static int starturbs(struct bc_state *bcs)
{
904
	struct bas_bc_state *ubc = bcs->hw.bas;
905 906 907 908 909 910 911 912 913
	struct urb *urb;
	int j, k;
	int rc;

	/* initialize L2 reception */
	if (bcs->proto2 == ISDN_PROTO_L2_HDLC)
		bcs->inputstate |= INS_flag_hunt;

	/* submit all isochronous input URBs */
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914
	ubc->running = 1;
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
	for (k = 0; k < BAS_INURBS; k++) {
		urb = ubc->isoinurbs[k];
		if (!urb) {
			rc = -EFAULT;
			goto error;
		}

		urb->dev = bcs->cs->hw.bas->udev;
		urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
		urb->transfer_flags = URB_ISO_ASAP;
		urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
		urb->transfer_buffer_length = BAS_INBUFSIZE;
		urb->number_of_packets = BAS_NUMFRAMES;
		urb->interval = BAS_FRAMETIME;
		urb->complete = read_iso_callback;
		urb->context = bcs;
		for (j = 0; j < BAS_NUMFRAMES; j++) {
			urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
			urb->iso_frame_desc[j].length = BAS_MAXFRAME;
			urb->iso_frame_desc[j].status = 0;
			urb->iso_frame_desc[j].actual_length = 0;
		}

		dump_urb(DEBUG_ISO, "Initial isoc read", urb);
939
		if ((rc = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970
			goto error;
	}

	/* initialize L2 transmission */
	gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);

	/* set up isochronous output URBs for flag idling */
	for (k = 0; k < BAS_OUTURBS; ++k) {
		urb = ubc->isoouturbs[k].urb;
		if (!urb) {
			rc = -EFAULT;
			goto error;
		}
		urb->dev = bcs->cs->hw.bas->udev;
		urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
		urb->transfer_flags = URB_ISO_ASAP;
		urb->transfer_buffer = ubc->isooutbuf->data;
		urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
		urb->number_of_packets = BAS_NUMFRAMES;
		urb->interval = BAS_FRAMETIME;
		urb->complete = write_iso_callback;
		urb->context = &ubc->isoouturbs[k];
		for (j = 0; j < BAS_NUMFRAMES; ++j) {
			urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
			urb->iso_frame_desc[j].length = BAS_NORMFRAME;
			urb->iso_frame_desc[j].status = 0;
			urb->iso_frame_desc[j].actual_length = 0;
		}
		ubc->isoouturbs[k].limit = -1;
	}

T
Tilman Schmidt 已提交
971 972
	/* keep one URB free, submit the others */
	for (k = 0; k < BAS_OUTURBS-1; ++k) {
973
		dump_urb(DEBUG_ISO, "Initial isoc write", urb);
974
		rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
975
		if (rc != 0)
976 977 978
			goto error;
	}
	dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
T
Tilman Schmidt 已提交
979
	ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996
	ubc->isooutdone = ubc->isooutovfl = NULL;
	return 0;
 error:
	stopurbs(ubc);
	return rc;
}

/* stopurbs
 * cancel the USB request blocks for isochronous input and output
 * errors are silently ignored
 * argument:
 *	B channel control structure
 */
static void stopurbs(struct bas_bc_state *ubc)
{
	int k, rc;

T
Tilman Schmidt 已提交
997
	ubc->running = 0;
998 999 1000

	for (k = 0; k < BAS_INURBS; ++k) {
		rc = usb_unlink_urb(ubc->isoinurbs[k]);
1001
		gig_dbg(DEBUG_ISO,
1002 1003
			"%s: isoc input URB %d unlinked, result = %s",
			__func__, k, get_usb_rcmsg(rc));
1004 1005 1006 1007
	}

	for (k = 0; k < BAS_OUTURBS; ++k) {
		rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1008
		gig_dbg(DEBUG_ISO,
1009 1010
			"%s: isoc output URB %d unlinked, result = %s",
			__func__, k, get_usb_rcmsg(rc));
1011 1012 1013 1014 1015 1016 1017 1018 1019
	}
}

/* Isochronous Write - Bottom Half */
/* =============================== */

/* submit_iso_write_urb
 * fill and submit the next isochronous write URB
 * parameters:
1020
 *	ucx	context structure containing URB
1021 1022 1023 1024 1025 1026 1027
 * return value:
 *	number of frames submitted in URB
 *	0 if URB not submitted because no data available (isooutbuf busy)
 *	error code < 0 on error
 */
static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
{
1028 1029
	struct urb *urb = ucx->urb;
	struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1030 1031 1032
	struct usb_iso_packet_descriptor *ifd;
	int corrbytes, nframe, rc;

1033 1034
	/* urb->dev is clobbered by USB subsystem */
	urb->dev = ucx->bcs->cs->hw.bas->udev;
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	urb->transfer_flags = URB_ISO_ASAP;
	urb->transfer_buffer = ubc->isooutbuf->data;
	urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);

	for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
		ifd = &urb->iso_frame_desc[nframe];

		/* compute frame length according to flow control */
		ifd->length = BAS_NORMFRAME;
		if ((corrbytes = atomic_read(&ubc->corrbytes)) != 0) {
1045 1046
			gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
				__func__, corrbytes);
1047 1048 1049 1050 1051 1052 1053 1054 1055
			if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
				corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
			else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
				corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
			ifd->length += corrbytes;
			atomic_add(-corrbytes, &ubc->corrbytes);
		}

		/* retrieve block of data to send */
1056 1057 1058
		rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
		if (rc < 0) {
			if (rc == -EBUSY) {
1059 1060 1061 1062 1063
				gig_dbg(DEBUG_ISO,
					"%s: buffer busy at frame %d",
					__func__, nframe);
				/* tasklet will be restarted from
				   gigaset_send_skb() */
1064
			} else {
1065 1066
				dev_err(ucx->bcs->cs->dev,
					"%s: buffer error %d at frame %d\n",
1067 1068
					__func__, rc, nframe);
				return rc;
1069 1070 1071
			}
			break;
		}
1072
		ifd->offset = rc;
T
Tilman Schmidt 已提交
1073
		ucx->limit = ubc->isooutbuf->nextread;
1074 1075 1076
		ifd->status = 0;
		ifd->actual_length = 0;
	}
1077 1078 1079
	if (unlikely(nframe == 0))
		return 0;	/* no data to send */
	urb->number_of_packets = nframe;
1080

1081
	rc = usb_submit_urb(urb, GFP_ATOMIC);
1082 1083 1084 1085 1086
	if (unlikely(rc)) {
		if (rc == -ENODEV)
			/* device removed - give up silently */
			gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
		else
1087 1088
			dev_err(ucx->bcs->cs->dev,
				"could not submit isochronous write URB: %s\n",
1089 1090
				get_usb_rcmsg(rc));
		return rc;
1091
	}
1092
	++ubc->numsub;
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103
	return nframe;
}

/* write_iso_tasklet
 * tasklet scheduled when an isochronous output URB from the Gigaset device
 * has completed
 * parameter:
 *	data	B channel state structure
 */
static void write_iso_tasklet(unsigned long data)
{
1104 1105 1106
	struct bc_state *bcs = (struct bc_state *) data;
	struct bas_bc_state *ubc = bcs->hw.bas;
	struct cardstate *cs = bcs->cs;
1107 1108
	struct isow_urbctx_t *done, *next, *ovfl;
	struct urb *urb;
1109
	int status;
1110 1111 1112 1113 1114 1115
	struct usb_iso_packet_descriptor *ifd;
	int offset;
	unsigned long flags;
	int i;
	struct sk_buff *skb;
	int len;
1116
	int rc;
1117 1118 1119

	/* loop while completed URBs arrive in time */
	for (;;) {
T
Tilman Schmidt 已提交
1120
		if (unlikely(!(ubc->running))) {
1121
			gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
			return;
		}

		/* retrieve completed URBs */
		spin_lock_irqsave(&ubc->isooutlock, flags);
		done = ubc->isooutdone;
		ubc->isooutdone = NULL;
		ovfl = ubc->isooutovfl;
		ubc->isooutovfl = NULL;
		spin_unlock_irqrestore(&ubc->isooutlock, flags);
		if (ovfl) {
1133
			dev_err(cs->dev, "isochronous write buffer underrun\n");
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
			error_hangup(bcs);
			break;
		}
		if (!done)
			break;

		/* submit free URB if available */
		spin_lock_irqsave(&ubc->isooutlock, flags);
		next = ubc->isooutfree;
		ubc->isooutfree = NULL;
		spin_unlock_irqrestore(&ubc->isooutlock, flags);
		if (next) {
1146 1147
			rc = submit_iso_write_urb(next);
			if (unlikely(rc <= 0 && rc != -ENODEV)) {
1148 1149 1150 1151 1152 1153 1154 1155 1156
				/* could not submit URB, put it back */
				spin_lock_irqsave(&ubc->isooutlock, flags);
				if (ubc->isooutfree == NULL) {
					ubc->isooutfree = next;
					next = NULL;
				}
				spin_unlock_irqrestore(&ubc->isooutlock, flags);
				if (next) {
					/* couldn't put it back */
1157 1158
					dev_err(cs->dev,
					      "losing isochronous write URB\n");
1159 1160 1161 1162 1163 1164 1165
					error_hangup(bcs);
				}
			}
		}

		/* process completed URB */
		urb = done->urb;
1166 1167
		status = done->status;
		switch (status) {
1168 1169 1170 1171
		case -EXDEV:			/* partial completion */
			gig_dbg(DEBUG_ISO, "%s: URB partially completed",
				__func__);
			/* fall through - what's the difference anyway? */
1172
		case 0:				/* normal completion */
1173 1174 1175
			/* inspect individual frames
			 * assumptions (for lack of documentation):
			 * - actual_length bytes of first frame in error are
1176
			 *   successfully sent
1177 1178
			 * - all following frames are not sent at all
			 */
1179
			offset = done->limit;	/* default (no error) */
1180 1181 1182 1183
			for (i = 0; i < BAS_NUMFRAMES; i++) {
				ifd = &urb->iso_frame_desc[i];
				if (ifd->status ||
				    ifd->actual_length != ifd->length) {
1184 1185 1186
					dev_warn(cs->dev,
					     "isochronous write: frame %d: %s, "
					     "only %d of %d bytes sent\n",
1187 1188 1189
					     i, get_usb_statmsg(ifd->status),
					     ifd->actual_length, ifd->length);
					offset = (ifd->offset +
1190 1191
						  ifd->actual_length)
						 % BAS_OUTBUFSIZE;
1192 1193 1194 1195 1196 1197 1198 1199 1200
					break;
				}
			}
#ifdef CONFIG_GIGASET_DEBUG
			/* check assumption on remaining frames */
			for (; i < BAS_NUMFRAMES; i++) {
				ifd = &urb->iso_frame_desc[i];
				if (ifd->status != -EINPROGRESS
				    || ifd->actual_length != 0) {
1201 1202 1203
					dev_warn(cs->dev,
					     "isochronous write: frame %d: %s, "
					     "%d of %d bytes sent\n",
1204 1205 1206
					     i, get_usb_statmsg(ifd->status),
					     ifd->actual_length, ifd->length);
					offset = (ifd->offset +
1207 1208
						  ifd->actual_length)
						 % BAS_OUTBUFSIZE;
1209 1210 1211 1212 1213
					break;
				}
			}
#endif
			break;
1214
		case -EPIPE:			/* stall - probably underrun */
1215
			dev_err(cs->dev, "isochronous write stalled\n");
1216 1217 1218
			error_hangup(bcs);
			break;
		default:			/* severe trouble */
1219
			dev_warn(cs->dev, "isochronous write: %s\n",
1220
				 get_usb_statmsg(status));
1221 1222 1223 1224
		}

		/* mark the write buffer area covered by this URB as free */
		if (done->limit >= 0)
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1225
			ubc->isooutbuf->read = done->limit;
1226 1227 1228 1229 1230 1231 1232 1233

		/* mark URB as free */
		spin_lock_irqsave(&ubc->isooutlock, flags);
		next = ubc->isooutfree;
		ubc->isooutfree = done;
		spin_unlock_irqrestore(&ubc->isooutlock, flags);
		if (next) {
			/* only one URB still active - resubmit one */
1234 1235
			rc = submit_iso_write_urb(next);
			if (unlikely(rc <= 0 && rc != -ENODEV)) {
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
				/* couldn't submit */
				error_hangup(bcs);
			}
		}
	}

	/* process queued SKBs */
	while ((skb = skb_dequeue(&bcs->squeue))) {
		/* copy to output buffer, doing L2 encapsulation */
		len = skb->len;
		if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
			/* insufficient buffer space, push back onto queue */
			skb_queue_head(&bcs->squeue, skb);
1249 1250
			gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
				__func__, skb_queue_len(&bcs->squeue));
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269
			break;
		}
		skb_pull(skb, len);
		gigaset_skb_sent(bcs, skb);
		dev_kfree_skb_any(skb);
	}
}

/* Isochronous Read - Bottom Half */
/* ============================== */

/* read_iso_tasklet
 * tasklet scheduled when an isochronous input URB from the Gigaset device
 * has completed
 * parameter:
 *	data	B channel state structure
 */
static void read_iso_tasklet(unsigned long data)
{
1270 1271 1272
	struct bc_state *bcs = (struct bc_state *) data;
	struct bas_bc_state *ubc = bcs->hw.bas;
	struct cardstate *cs = bcs->cs;
1273
	struct urb *urb;
1274
	int status;
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
	char *rcvbuf;
	unsigned long flags;
	int totleft, numbytes, offset, frame, rc;

	/* loop while more completed URBs arrive in the meantime */
	for (;;) {
		/* retrieve URB */
		spin_lock_irqsave(&ubc->isoinlock, flags);
		if (!(urb = ubc->isoindone)) {
			spin_unlock_irqrestore(&ubc->isoinlock, flags);
			return;
		}
1287
		status = ubc->isoinstatus;
1288 1289
		ubc->isoindone = NULL;
		if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1290 1291 1292 1293 1294
			dev_warn(cs->dev,
				 "isochronous read overrun, "
				 "dropped URB with status: %s, %d bytes lost\n",
				 get_usb_statmsg(ubc->loststatus),
				 ubc->isoinlost);
1295 1296 1297 1298
			ubc->loststatus = -EINPROGRESS;
		}
		spin_unlock_irqrestore(&ubc->isoinlock, flags);

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1299
		if (unlikely(!(ubc->running))) {
1300 1301 1302
			gig_dbg(DEBUG_ISO,
				"%s: channel not running, "
				"dropped URB with status: %s",
1303
				__func__, get_usb_statmsg(status));
1304 1305 1306
			return;
		}

1307
		switch (status) {
1308 1309
		case 0:				/* normal completion */
			break;
1310 1311
		case -EXDEV:			/* inspect individual frames
						   (we do that anyway) */
1312 1313
			gig_dbg(DEBUG_ISO, "%s: URB partially completed",
				__func__);
1314 1315 1316
			break;
		case -ENOENT:
		case -ECONNRESET:
1317 1318
		case -EINPROGRESS:
			gig_dbg(DEBUG_ISO, "%s: %s",
1319
				__func__, get_usb_statmsg(status));
1320 1321
			continue;		/* -> skip */
		case -EPIPE:
1322
			dev_err(cs->dev, "isochronous read stalled\n");
1323 1324 1325
			error_hangup(bcs);
			continue;		/* -> skip */
		default:			/* severe trouble */
1326
			dev_warn(cs->dev, "isochronous read: %s\n",
1327
				 get_usb_statmsg(status));
1328 1329 1330 1331 1332 1333
			goto error;
		}

		rcvbuf = urb->transfer_buffer;
		totleft = urb->actual_length;
		for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1334 1335
			numbytes = urb->iso_frame_desc[frame].actual_length;
			if (unlikely(urb->iso_frame_desc[frame].status))
1336
				dev_warn(cs->dev,
1337 1338
					 "isochronous read: frame %d[%d]: %s\n",
					 frame, numbytes,
1339 1340
					 get_usb_statmsg(
					    urb->iso_frame_desc[frame].status));
1341
			if (unlikely(numbytes > BAS_MAXFRAME))
1342 1343 1344 1345
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "numbytes (%d) > BAS_MAXFRAME\n",
					 frame, numbytes);
1346
			if (unlikely(numbytes > totleft)) {
1347 1348 1349 1350
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "numbytes (%d) > totleft (%d)\n",
					 frame, numbytes, totleft);
1351
				numbytes = totleft;
1352 1353 1354
			}
			offset = urb->iso_frame_desc[frame].offset;
			if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1355 1356 1357 1358 1359
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "offset (%d) + numbytes (%d) "
					 "> BAS_INBUFSIZE\n",
					 frame, offset, numbytes);
1360
				numbytes = BAS_INBUFSIZE - offset;
1361 1362 1363 1364 1365
			}
			gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
			totleft -= numbytes;
		}
		if (unlikely(totleft > 0))
1366 1367 1368
			dev_warn(cs->dev,
				 "isochronous read: %d data bytes missing\n",
				 totleft);
1369 1370 1371 1372 1373 1374 1375

	error:
		/* URB processed, resubmit */
		for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
			urb->iso_frame_desc[frame].status = 0;
			urb->iso_frame_desc[frame].actual_length = 0;
		}
1376 1377
		/* urb->dev is clobbered by USB subsystem */
		urb->dev = bcs->cs->hw.bas->udev;
1378 1379
		urb->transfer_flags = URB_ISO_ASAP;
		urb->number_of_packets = BAS_NUMFRAMES;
1380
		rc = usb_submit_urb(urb, GFP_ATOMIC);
1381
		if (unlikely(rc != 0 && rc != -ENODEV)) {
1382 1383
			dev_err(cs->dev,
				"could not resubmit isochronous read URB: %s\n",
1384
				get_usb_rcmsg(rc));
1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401
			dump_urb(DEBUG_ISO, "resubmit iso read", urb);
			error_hangup(bcs);
		}
	}
}

/* Channel Operations */
/* ================== */

/* req_timeout
 * timeout routine for control output request
 * argument:
 *	B channel control structure
 */
static void req_timeout(unsigned long data)
{
	struct bc_state *bcs = (struct bc_state *) data;
1402
	struct bas_cardstate *ucs = bcs->cs->hw.bas;
1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414
	int pending;
	unsigned long flags;

	check_pending(ucs);

	spin_lock_irqsave(&ucs->lock, flags);
	pending = ucs->pending;
	ucs->pending = 0;
	spin_unlock_irqrestore(&ucs->lock, flags);

	switch (pending) {
	case 0:					/* no pending request */
1415
		gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1416 1417 1418
		break;

	case HD_OPEN_ATCHANNEL:
1419
		dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1420 1421 1422 1423 1424
		error_reset(bcs->cs);
		break;

	case HD_OPEN_B2CHANNEL:
	case HD_OPEN_B1CHANNEL:
1425 1426
		dev_err(bcs->cs->dev, "timeout opening channel %d\n",
			bcs->channel + 1);
1427 1428 1429 1430
		error_hangup(bcs);
		break;

	case HD_CLOSE_ATCHANNEL:
1431
		dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1432 1433 1434 1435
		break;

	case HD_CLOSE_B2CHANNEL:
	case HD_CLOSE_B1CHANNEL:
1436 1437
		dev_err(bcs->cs->dev, "timeout closing channel %d\n",
			bcs->channel + 1);
1438
		error_reset(bcs->cs);
1439 1440 1441
		break;

	default:
1442 1443
		dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
			 pending);
1444
	}
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1445 1446

	wake_up(&ucs->waitqueue);
1447 1448 1449 1450 1451 1452 1453 1454 1455
}

/* write_ctrl_callback
 * USB completion handler for control pipe output
 * called by the USB subsystem in interrupt context
 * parameter:
 *	urb	USB request block of completed request
 *		urb->context = hardware specific controller state structure
 */
1456
static void write_ctrl_callback(struct urb *urb)
1457
{
1458
	struct bas_cardstate *ucs = urb->context;
1459
	int status = urb->status;
1460
	int rc;
1461 1462
	unsigned long flags;

1463
	/* check status */
1464
	switch (status) {
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
	case 0:					/* normal completion */
		spin_lock_irqsave(&ucs->lock, flags);
		switch (ucs->pending) {
		case HD_DEVICE_INIT_ACK:	/* no reply expected */
			del_timer(&ucs->timer_ctrl);
			ucs->pending = 0;
			break;
		}
		spin_unlock_irqrestore(&ucs->lock, flags);
		return;

	case -ENOENT:			/* cancelled */
	case -ECONNRESET:		/* cancelled (async) */
	case -EINPROGRESS:		/* pending */
	case -ENODEV:			/* device removed */
	case -ESHUTDOWN:		/* device shut down */
		/* ignore silently */
		gig_dbg(DEBUG_USBREQ, "%s: %s",
1483
			__func__, get_usb_statmsg(status));
1484
		break;
1485 1486

	default:				/* any failure */
T
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1487 1488
		/* don't retry if suspend requested */
		if (++ucs->retry_ctrl > BAS_RETRY ||
T
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1489
		    (ucs->basstate & BS_SUSPEND)) {
1490 1491 1492
			dev_err(&ucs->interface->dev,
				"control request 0x%02x failed: %s\n",
				ucs->dr_ctrl.bRequest,
1493
				get_usb_statmsg(status));
1494 1495 1496 1497
			break;		/* give up */
		}
		dev_notice(&ucs->interface->dev,
			   "control request 0x%02x: %s, retry %d\n",
1498
			   ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1499 1500 1501
			   ucs->retry_ctrl);
		/* urb->dev is clobbered by USB subsystem */
		urb->dev = ucs->udev;
1502
		rc = usb_submit_urb(urb, GFP_ATOMIC);
1503 1504 1505 1506 1507 1508 1509 1510
		if (unlikely(rc)) {
			dev_err(&ucs->interface->dev,
				"could not resubmit request 0x%02x: %s\n",
				ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
			break;
		}
		/* resubmitted */
		return;
1511
	}
1512 1513 1514 1515 1516

	/* failed, clear pending request */
	spin_lock_irqsave(&ucs->lock, flags);
	del_timer(&ucs->timer_ctrl);
	ucs->pending = 0;
1517
	spin_unlock_irqrestore(&ucs->lock, flags);
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1518
	wake_up(&ucs->waitqueue);
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
}

/* req_submit
 * submit a control output request without message buffer to the Gigaset base
 * and optionally start a timeout
 * parameters:
 *	bcs	B channel control structure
 *	req	control request code (HD_*)
 *	val	control request parameter value (set to 0 if unused)
 *	timeout	timeout in seconds (0: no timeout)
 * return value:
 *	0 on success
 *	-EBUSY if another request is pending
 *	any URB submission error code
 */
static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
{
1536
	struct bas_cardstate *ucs = bcs->cs->hw.bas;
1537 1538 1539
	int ret;
	unsigned long flags;

1540
	gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1541 1542 1543 1544

	spin_lock_irqsave(&ucs->lock, flags);
	if (ucs->pending) {
		spin_unlock_irqrestore(&ucs->lock, flags);
1545 1546 1547 1548
		dev_err(bcs->cs->dev,
			"submission of request 0x%02x failed: "
			"request 0x%02x still pending\n",
			req, ucs->pending);
1549 1550 1551 1552 1553 1554 1555 1556 1557
		return -EBUSY;
	}

	ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
	ucs->dr_ctrl.bRequest = req;
	ucs->dr_ctrl.wValue = cpu_to_le16(val);
	ucs->dr_ctrl.wIndex = 0;
	ucs->dr_ctrl.wLength = 0;
	usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1558 1559 1560
			     usb_sndctrlpipe(ucs->udev, 0),
			     (unsigned char*) &ucs->dr_ctrl, NULL, 0,
			     write_ctrl_callback, ucs);
1561
	ucs->retry_ctrl = 0;
1562
	ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1563
	if (unlikely(ret)) {
1564
		dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1565
			req, get_usb_rcmsg(ret));
1566 1567 1568 1569 1570 1571
		spin_unlock_irqrestore(&ucs->lock, flags);
		return ret;
	}
	ucs->pending = req;

	if (timeout > 0) {
1572
		gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
		ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
		ucs->timer_ctrl.data = (unsigned long) bcs;
		ucs->timer_ctrl.function = req_timeout;
		add_timer(&ucs->timer_ctrl);
	}

	spin_unlock_irqrestore(&ucs->lock, flags);
	return 0;
}

/* gigaset_init_bchannel
 * called by common.c to connect a B channel
 * initialize isochronous I/O and tell the Gigaset base to open the channel
 * argument:
 *	B channel control structure
 * return value:
 *	0 on success, error code < 0 on error
 */
static int gigaset_init_bchannel(struct bc_state *bcs)
{
T
Tilman Schmidt 已提交
1593
	struct cardstate *cs = bcs->cs;
1594
	int req, ret;
1595 1596
	unsigned long flags;

T
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1597 1598
	spin_lock_irqsave(&cs->lock, flags);
	if (unlikely(!cs->connected)) {
1599
		gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
T
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1600
		spin_unlock_irqrestore(&cs->lock, flags);
1601 1602
		return -ENODEV;
	}
1603

T
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1604
	if (cs->hw.bas->basstate & BS_SUSPEND) {
T
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1605 1606 1607 1608 1609 1610 1611
		dev_notice(cs->dev,
			   "not starting isochronous I/O, "
			   "suspend in progress\n");
		spin_unlock_irqrestore(&cs->lock, flags);
		return -EHOSTUNREACH;
	}

1612
	if ((ret = starturbs(bcs)) < 0) {
T
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1613
		dev_err(cs->dev,
1614 1615 1616 1617 1618
			"could not start isochronous I/O for channel B%d: %s\n",
			bcs->channel + 1,
			ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
		if (ret != -ENODEV)
			error_hangup(bcs);
T
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1619
		spin_unlock_irqrestore(&cs->lock, flags);
1620 1621 1622 1623 1624
		return ret;
	}

	req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
	if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0) {
T
Tilman Schmidt 已提交
1625
		dev_err(cs->dev, "could not open channel B%d\n",
1626
			bcs->channel + 1);
1627
		stopurbs(bcs->hw.bas);
1628 1629
		if (ret != -ENODEV)
			error_hangup(bcs);
1630
	}
1631

T
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1632
	spin_unlock_irqrestore(&cs->lock, flags);
1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647
	return ret;
}

/* gigaset_close_bchannel
 * called by common.c to disconnect a B channel
 * tell the Gigaset base to close the channel
 * stopping isochronous I/O and LL notification will be done when the
 * acknowledgement for the close arrives
 * argument:
 *	B channel control structure
 * return value:
 *	0 on success, error code < 0 on error
 */
static int gigaset_close_bchannel(struct bc_state *bcs)
{
T
Tilman Schmidt 已提交
1648
	struct cardstate *cs = bcs->cs;
1649
	int req, ret;
1650 1651
	unsigned long flags;

T
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1652 1653 1654
	spin_lock_irqsave(&cs->lock, flags);
	if (unlikely(!cs->connected)) {
		spin_unlock_irqrestore(&cs->lock, flags);
1655 1656 1657
		gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
		return -ENODEV;
	}
1658

T
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1659
	if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1660
		/* channel not running: just signal common.c */
T
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1661
		spin_unlock_irqrestore(&cs->lock, flags);
1662 1663 1664 1665
		gigaset_bchannel_down(bcs);
		return 0;
	}

1666
	/* channel running: tell device to close it */
1667 1668
	req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
	if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0)
T
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1669
		dev_err(cs->dev, "closing channel B%d failed\n",
1670 1671
			bcs->channel + 1);

T
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1672
	spin_unlock_irqrestore(&cs->lock, flags);
1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686
	return ret;
}

/* Device Operations */
/* ================= */

/* complete_cb
 * unqueue first command buffer from queue, waking any sleepers
 * must be called with cs->cmdlock held
 * parameter:
 *	cs	controller state structure
 */
static void complete_cb(struct cardstate *cs)
{
1687
	struct cmdbuf_t *cb = cs->cmdbuf;
1688 1689 1690

	/* unqueue completed buffer */
	cs->cmdbytes -= cs->curlen;
1691 1692 1693
	gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
		"write_command: sent %u bytes, %u left",
		cs->curlen, cs->cmdbytes);
1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714
	if ((cs->cmdbuf = cb->next) != NULL) {
		cs->cmdbuf->prev = NULL;
		cs->curlen = cs->cmdbuf->len;
	} else {
		cs->lastcmdbuf = NULL;
		cs->curlen = 0;
	}

	if (cb->wake_tasklet)
		tasklet_schedule(cb->wake_tasklet);

	kfree(cb);
}

/* write_command_callback
 * USB completion handler for AT command transmission
 * called by the USB subsystem in interrupt context
 * parameter:
 *	urb	USB request block of completed request
 *		urb->context = controller state structure
 */
1715
static void write_command_callback(struct urb *urb)
1716
{
1717 1718
	struct cardstate *cs = urb->context;
	struct bas_cardstate *ucs = cs->hw.bas;
1719
	int status = urb->status;
1720 1721
	unsigned long flags;

1722
	update_basstate(ucs, 0, BS_ATWRPEND);
T
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1723
	wake_up(&ucs->waitqueue);
1724

1725
	/* check status */
1726
	switch (status) {
1727 1728
	case 0:					/* normal completion */
		break;
1729 1730
	case -ENOENT:			/* cancelled */
	case -ECONNRESET:		/* cancelled (async) */
1731
	case -EINPROGRESS:		/* pending */
1732 1733
	case -ENODEV:			/* device removed */
	case -ESHUTDOWN:		/* device shut down */
1734
		/* ignore silently */
1735
		gig_dbg(DEBUG_USBREQ, "%s: %s",
1736
			__func__, get_usb_statmsg(status));
1737 1738 1739
		return;
	default:				/* any failure */
		if (++ucs->retry_cmd_out > BAS_RETRY) {
1740 1741 1742
			dev_warn(cs->dev,
				 "command write: %s, "
				 "giving up after %d retries\n",
1743
				 get_usb_statmsg(status),
1744
				 ucs->retry_cmd_out);
1745 1746
			break;
		}
T
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1747
		if (ucs->basstate & BS_SUSPEND) {
T
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1748 1749 1750 1751 1752 1753
			dev_warn(cs->dev,
				 "command write: %s, "
				 "won't retry - suspend requested\n",
				 get_usb_statmsg(status));
			break;
		}
1754
		if (cs->cmdbuf == NULL) {
1755 1756 1757
			dev_warn(cs->dev,
				 "command write: %s, "
				 "cannot retry - cmdbuf gone\n",
1758
				 get_usb_statmsg(status));
1759 1760
			break;
		}
1761
		dev_notice(cs->dev, "command write: %s, retry %d\n",
1762
			   get_usb_statmsg(status), ucs->retry_cmd_out);
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783
		if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
			/* resubmitted - bypass regular exit block */
			return;
		/* command send failed, assume base still waiting */
		update_basstate(ucs, BS_ATREADY, 0);
	}

	spin_lock_irqsave(&cs->cmdlock, flags);
	if (cs->cmdbuf != NULL)
		complete_cb(cs);
	spin_unlock_irqrestore(&cs->cmdlock, flags);
}

/* atrdy_timeout
 * timeout routine for AT command transmission
 * argument:
 *	controller state structure
 */
static void atrdy_timeout(unsigned long data)
{
	struct cardstate *cs = (struct cardstate *) data;
1784
	struct bas_cardstate *ucs = cs->hw.bas;
1785

1786
	dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805

	/* fake the missing signal - what else can I do? */
	update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
	start_cbsend(cs);
}

/* atwrite_submit
 * submit an HD_WRITE_ATMESSAGE command URB
 * parameters:
 *	cs	controller state structure
 *	buf	buffer containing command to send
 *	len	length of command to send
 * return value:
 *	0 on success
 *	-EBUSY if another request is pending
 *	any URB submission error code
 */
static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
{
1806
	struct bas_cardstate *ucs = cs->hw.bas;
1807
	int rc;
1808

1809
	gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1810

1811
	if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1812 1813
		dev_err(cs->dev,
			"could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
		return -EBUSY;
	}

	ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
	ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
	ucs->dr_cmd_out.wValue = 0;
	ucs->dr_cmd_out.wIndex = 0;
	ucs->dr_cmd_out.wLength = cpu_to_le16(len);
	usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
			     usb_sndctrlpipe(ucs->udev, 0),
			     (unsigned char*) &ucs->dr_cmd_out, buf, len,
			     write_command_callback, cs);
1826
	rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1827 1828
	if (unlikely(rc)) {
		update_basstate(ucs, 0, BS_ATWRPEND);
1829
		dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1830 1831
			get_usb_rcmsg(rc));
		return rc;
1832 1833
	}

1834 1835
	/* submitted successfully, start timeout if necessary */
	if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1836 1837
		gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
			ATRDY_TIMEOUT);
1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
		ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
		ucs->timer_atrdy.data = (unsigned long) cs;
		ucs->timer_atrdy.function = atrdy_timeout;
		add_timer(&ucs->timer_atrdy);
	}
	return 0;
}

/* start_cbsend
 * start transmission of AT command queue if necessary
 * parameter:
 *	cs		controller state structure
 * return value:
 *	0 on success
 *	error code < 0 on error
 */
static int start_cbsend(struct cardstate *cs)
{
	struct cmdbuf_t *cb;
1857
	struct bas_cardstate *ucs = cs->hw.bas;
1858 1859 1860 1861
	unsigned long flags;
	int rc;
	int retval = 0;

T
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1862
	/* check if suspend requested */
T
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1863
	if (ucs->basstate & BS_SUSPEND) {
T
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1864 1865 1866 1867
		gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
		return -EHOSTUNREACH;
	}

1868
	/* check if AT channel is open */
T
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1869
	if (!(ucs->basstate & BS_ATOPEN)) {
1870
		gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884
		rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
		if (rc < 0) {
			/* flush command queue */
			spin_lock_irqsave(&cs->cmdlock, flags);
			while (cs->cmdbuf != NULL)
				complete_cb(cs);
			spin_unlock_irqrestore(&cs->cmdlock, flags);
		}
		return rc;
	}

	/* try to send first command in queue */
	spin_lock_irqsave(&cs->cmdlock, flags);

T
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1885
	while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
		ucs->retry_cmd_out = 0;
		rc = atwrite_submit(cs, cb->buf, cb->len);
		if (unlikely(rc)) {
			retval = rc;
			complete_cb(cs);
		}
	}

	spin_unlock_irqrestore(&cs->cmdlock, flags);
	return retval;
}

/* gigaset_write_cmd
 * This function is called by the device independent part of the driver
 * to transmit an AT command string to the Gigaset device.
 * It encapsulates the device specific method for transmission over the
 * direct USB connection to the base.
 * The command string is added to the queue of commands to send, and
 * USB transmission is started if necessary.
 * parameters:
 *	cs		controller state structure
 *	buf		command string to send
 *	len		number of bytes to send (max. IF_WRITEBUF)
1909 1910
 *	wake_tasklet	tasklet to run when transmission is completed
 *			(NULL if none)
1911 1912 1913 1914 1915
 * return value:
 *	number of bytes queued on success
 *	error code < 0 on error
 */
static int gigaset_write_cmd(struct cardstate *cs,
1916 1917
			     const unsigned char *buf, int len,
			     struct tasklet_struct *wake_tasklet)
1918 1919 1920
{
	struct cmdbuf_t *cb;
	unsigned long flags;
1921
	int rc;
1922

T
Tilman Schmidt 已提交
1923
	gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1924
			     DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1925
			   "CMD Transmit", len, buf);
1926

1927 1928 1929 1930 1931
	if (len <= 0) {
		/* nothing to do */
		rc = 0;
		goto notqueued;
	}
1932 1933 1934 1935

	if (len > IF_WRITEBUF)
		len = IF_WRITEBUF;
	if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
1936
		dev_err(cs->dev, "%s: out of memory\n", __func__);
1937 1938
		rc = -ENOMEM;
		goto notqueued;
1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958
	}

	memcpy(cb->buf, buf, len);
	cb->len = len;
	cb->offset = 0;
	cb->next = NULL;
	cb->wake_tasklet = wake_tasklet;

	spin_lock_irqsave(&cs->cmdlock, flags);
	cb->prev = cs->lastcmdbuf;
	if (cs->lastcmdbuf)
		cs->lastcmdbuf->next = cb;
	else {
		cs->cmdbuf = cb;
		cs->curlen = len;
	}
	cs->cmdbytes += len;
	cs->lastcmdbuf = cb;
	spin_unlock_irqrestore(&cs->cmdlock, flags);

1959 1960 1961 1962
	spin_lock_irqsave(&cs->lock, flags);
	if (unlikely(!cs->connected)) {
		spin_unlock_irqrestore(&cs->lock, flags);
		gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1963 1964 1965 1966 1967
		/* flush command queue */
		spin_lock_irqsave(&cs->cmdlock, flags);
		while (cs->cmdbuf != NULL)
			complete_cb(cs);
		spin_unlock_irqrestore(&cs->cmdlock, flags);
1968 1969
		return -ENODEV;
	}
1970
	rc = start_cbsend(cs);
1971
	spin_unlock_irqrestore(&cs->lock, flags);
1972 1973 1974 1975 1976 1977
	return rc < 0 ? rc : len;

notqueued:			/* request handled without queuing */
	if (wake_tasklet)
		tasklet_schedule(wake_tasklet);
	return rc;
1978 1979 1980 1981
}

/* gigaset_write_room
 * tty_driver.write_room interface routine
1982 1983
 * return number of characters the driver will accept to be written via
 * gigaset_write_cmd
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
 * parameter:
 *	controller state structure
 * return value:
 *	number of characters
 */
static int gigaset_write_room(struct cardstate *cs)
{
	return IF_WRITEBUF;
}

/* gigaset_chars_in_buffer
 * tty_driver.chars_in_buffer interface routine
 * return number of characters waiting to be sent
 * parameter:
 *	controller state structure
 * return value:
 *	number of characters
 */
static int gigaset_chars_in_buffer(struct cardstate *cs)
{
T
Tilman Schmidt 已提交
2004
	return cs->cmdbytes;
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
}

/* gigaset_brkchars
 * implementation of ioctl(GIGASET_BRKCHARS)
 * parameter:
 *	controller state structure
 * return value:
 *	-EINVAL (unimplemented function)
 */
static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
{
	return -EINVAL;
}


/* Device Initialization/Shutdown */
/* ============================== */

/* Free hardware dependent part of the B channel structure
 * parameter:
 *	bcs	B channel structure
 * return value:
 *	!=0 on success
 */
static int gigaset_freebcshw(struct bc_state *bcs)
{
2031 2032 2033 2034
	struct bas_bc_state *ubc = bcs->hw.bas;
	int i;

	if (!ubc)
2035 2036
		return 0;

2037
	/* kill URBs and tasklets before freeing - better safe than sorry */
T
Tilman Schmidt 已提交
2038
	ubc->running = 0;
2039 2040 2041 2042 2043 2044 2045 2046 2047
	gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
	for (i = 0; i < BAS_OUTURBS; ++i) {
		usb_kill_urb(ubc->isoouturbs[i].urb);
		usb_free_urb(ubc->isoouturbs[i].urb);
	}
	for (i = 0; i < BAS_INURBS; ++i) {
		usb_kill_urb(ubc->isoinurbs[i]);
		usb_free_urb(ubc->isoinurbs[i]);
	}
2048 2049 2050 2051
	tasklet_kill(&ubc->sent_tasklet);
	tasklet_kill(&ubc->rcvd_tasklet);
	kfree(ubc->isooutbuf);
	kfree(ubc);
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068
	bcs->hw.bas = NULL;
	return 1;
}

/* Initialize hardware dependent part of the B channel structure
 * parameter:
 *	bcs	B channel structure
 * return value:
 *	!=0 on success
 */
static int gigaset_initbcshw(struct bc_state *bcs)
{
	int i;
	struct bas_bc_state *ubc;

	bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
	if (!ubc) {
2069
		pr_err("out of memory\n");
2070 2071 2072
		return 0;
	}

T
Tilman Schmidt 已提交
2073
	ubc->running = 0;
2074 2075 2076 2077 2078 2079 2080 2081 2082
	atomic_set(&ubc->corrbytes, 0);
	spin_lock_init(&ubc->isooutlock);
	for (i = 0; i < BAS_OUTURBS; ++i) {
		ubc->isoouturbs[i].urb = NULL;
		ubc->isoouturbs[i].bcs = bcs;
	}
	ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
	ubc->numsub = 0;
	if (!(ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL))) {
2083
		pr_err("out of memory\n");
2084 2085 2086 2087 2088
		kfree(ubc);
		bcs->hw.bas = NULL;
		return 0;
	}
	tasklet_init(&ubc->sent_tasklet,
2089
		     &write_iso_tasklet, (unsigned long) bcs);
2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109

	spin_lock_init(&ubc->isoinlock);
	for (i = 0; i < BAS_INURBS; ++i)
		ubc->isoinurbs[i] = NULL;
	ubc->isoindone = NULL;
	ubc->loststatus = -EINPROGRESS;
	ubc->isoinlost = 0;
	ubc->seqlen = 0;
	ubc->inbyte = 0;
	ubc->inbits = 0;
	ubc->goodbytes = 0;
	ubc->alignerrs = 0;
	ubc->fcserrs = 0;
	ubc->frameerrs = 0;
	ubc->giants = 0;
	ubc->runts = 0;
	ubc->aborts = 0;
	ubc->shared0s = 0;
	ubc->stolen0s = 0;
	tasklet_init(&ubc->rcvd_tasklet,
2110
		     &read_iso_tasklet, (unsigned long) bcs);
2111 2112 2113 2114 2115 2116 2117
	return 1;
}

static void gigaset_reinitbcshw(struct bc_state *bcs)
{
	struct bas_bc_state *ubc = bcs->hw.bas;

T
Tilman Schmidt 已提交
2118
	bcs->hw.bas->running = 0;
2119 2120 2121 2122 2123 2124 2125 2126 2127
	atomic_set(&bcs->hw.bas->corrbytes, 0);
	bcs->hw.bas->numsub = 0;
	spin_lock_init(&ubc->isooutlock);
	spin_lock_init(&ubc->isoinlock);
	ubc->loststatus = -EINPROGRESS;
}

static void gigaset_freecshw(struct cardstate *cs)
{
2128
	/* timers, URBs and rcvbuf are disposed of in disconnect */
2129
	kfree(cs->hw.bas->int_in_buf);
2130
	kfree(cs->hw.bas);
2131
	cs->hw.bas = NULL;
2132 2133 2134 2135 2136 2137 2138
}

static int gigaset_initcshw(struct cardstate *cs)
{
	struct bas_cardstate *ucs;

	cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2139 2140
	if (!ucs) {
		pr_err("out of memory\n");
2141
		return 0;
2142
	}
2143 2144 2145 2146 2147 2148
	ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
	if (!ucs->int_in_buf) {
		kfree(ucs);
		pr_err("out of memory\n");
		return 0;
	}
2149 2150 2151 2152 2153 2154 2155 2156 2157

	ucs->urb_cmd_in = NULL;
	ucs->urb_cmd_out = NULL;
	ucs->rcvbuf = NULL;
	ucs->rcvbuf_size = 0;

	spin_lock_init(&ucs->lock);
	ucs->pending = 0;

T
Tilman Schmidt 已提交
2158
	ucs->basstate = 0;
2159 2160 2161
	init_timer(&ucs->timer_ctrl);
	init_timer(&ucs->timer_atrdy);
	init_timer(&ucs->timer_cmd_in);
T
Tilman Schmidt 已提交
2162
	init_waitqueue_head(&ucs->waitqueue);
2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174

	return 1;
}

/* freeurbs
 * unlink and deallocate all URBs unconditionally
 * caller must make sure that no commands are still in progress
 * parameter:
 *	cs	controller state structure
 */
static void freeurbs(struct cardstate *cs)
{
2175
	struct bas_cardstate *ucs = cs->hw.bas;
2176 2177 2178
	struct bas_bc_state *ubc;
	int i, j;

2179
	gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
T
Tilman Schmidt 已提交
2180
	for (j = 0; j < BAS_CHANNELS; ++j) {
2181
		ubc = cs->bcs[j].hw.bas;
2182 2183 2184 2185 2186 2187 2188 2189 2190 2191
		for (i = 0; i < BAS_OUTURBS; ++i) {
			usb_kill_urb(ubc->isoouturbs[i].urb);
			usb_free_urb(ubc->isoouturbs[i].urb);
			ubc->isoouturbs[i].urb = NULL;
		}
		for (i = 0; i < BAS_INURBS; ++i) {
			usb_kill_urb(ubc->isoinurbs[i]);
			usb_free_urb(ubc->isoinurbs[i]);
			ubc->isoinurbs[i] = NULL;
		}
2192
	}
2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204
	usb_kill_urb(ucs->urb_int_in);
	usb_free_urb(ucs->urb_int_in);
	ucs->urb_int_in = NULL;
	usb_kill_urb(ucs->urb_cmd_out);
	usb_free_urb(ucs->urb_cmd_out);
	ucs->urb_cmd_out = NULL;
	usb_kill_urb(ucs->urb_cmd_in);
	usb_free_urb(ucs->urb_cmd_in);
	ucs->urb_cmd_in = NULL;
	usb_kill_urb(ucs->urb_ctrl);
	usb_free_urb(ucs->urb_ctrl);
	ucs->urb_ctrl = NULL;
2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220
}

/* gigaset_probe
 * This function is called when a new USB device is connected.
 * It checks whether the new device is handled by this driver.
 */
static int gigaset_probe(struct usb_interface *interface,
			 const struct usb_device_id *id)
{
	struct usb_host_interface *hostif;
	struct usb_device *udev = interface_to_usbdev(interface);
	struct cardstate *cs = NULL;
	struct bas_cardstate *ucs = NULL;
	struct bas_bc_state *ubc;
	struct usb_endpoint_descriptor *endpoint;
	int i, j;
2221
	int rc;
2222

2223 2224 2225 2226
	gig_dbg(DEBUG_ANY,
		"%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
		__func__, le16_to_cpu(udev->descriptor.idVendor),
		le16_to_cpu(udev->descriptor.idProduct));
2227 2228 2229 2230

	/* set required alternate setting */
	hostif = interface->cur_altsetting;
	if (hostif->desc.bAlternateSetting != 3) {
2231 2232 2233
		gig_dbg(DEBUG_ANY,
			"%s: wrong alternate setting %d - trying to switch",
			__func__, hostif->desc.bAlternateSetting);
2234
		if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3) < 0) {
2235 2236 2237 2238
			dev_warn(&udev->dev, "usb_set_interface failed, "
				 "device %d interface %d altsetting %d\n",
				 udev->devnum, hostif->desc.bInterfaceNumber,
				 hostif->desc.bAlternateSetting);
2239 2240 2241 2242 2243 2244 2245 2246
			return -ENODEV;
		}
		hostif = interface->cur_altsetting;
	}

	/* Reject application specific interfaces
	 */
	if (hostif->desc.bInterfaceClass != 255) {
2247 2248
		dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
			 __func__, hostif->desc.bInterfaceClass);
2249 2250 2251
		return -ENODEV;
	}

2252 2253 2254 2255
	dev_info(&udev->dev,
		 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
		 __func__, le16_to_cpu(udev->descriptor.idVendor),
		 le16_to_cpu(udev->descriptor.idProduct));
2256

T
Tilman Schmidt 已提交
2257 2258 2259 2260
	/* allocate memory for our device state and intialize it */
	cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
			    GIGASET_MODULENAME);
	if (!cs)
2261 2262
		return -ENODEV;
	ucs = cs->hw.bas;
2263 2264 2265

	/* save off device structure ptrs for later use */
	usb_get_dev(udev);
2266 2267
	ucs->udev = udev;
	ucs->interface = interface;
2268
	cs->dev = &interface->dev;
2269 2270 2271 2272 2273 2274

	/* allocate URBs:
	 * - one for the interrupt pipe
	 * - three for the different uses of the default control pipe
	 * - three for each isochronous pipe
	 */
2275 2276 2277 2278
	if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
	    !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
	    !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
	    !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2279
		goto allocerr;
2280

T
Tilman Schmidt 已提交
2281
	for (j = 0; j < BAS_CHANNELS; ++j) {
2282
		ubc = cs->bcs[j].hw.bas;
2283 2284
		for (i = 0; i < BAS_OUTURBS; ++i)
			if (!(ubc->isoouturbs[i].urb =
2285
			      usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2286 2287 2288
				goto allocerr;
		for (i = 0; i < BAS_INURBS; ++i)
			if (!(ubc->isoinurbs[i] =
2289
			      usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2290
				goto allocerr;
2291 2292 2293 2294 2295 2296 2297 2298
	}

	ucs->rcvbuf = NULL;
	ucs->rcvbuf_size = 0;

	/* Fill the interrupt urb and send it to the core */
	endpoint = &hostif->endpoint[0].desc;
	usb_fill_int_urb(ucs->urb_int_in, udev,
2299 2300
			 usb_rcvintpipe(udev,
					(endpoint->bEndpointAddress) & 0x0f),
2301
			 ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2302
			 endpoint->bInterval);
2303
	if ((rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL)) != 0) {
2304
		dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2305
			get_usb_rcmsg(rc));
2306 2307 2308 2309
		goto error;
	}

	/* tell the device that the driver is ready */
2310
	if ((rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0)) != 0)
2311 2312 2313 2314
		goto error;

	/* tell common part that the device is ready */
	if (startmode == SM_LOCKED)
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2315
		cs->mstate = MS_LOCKED;
2316 2317 2318 2319

	/* save address of controller structure */
	usb_set_intfdata(interface, cs);

2320 2321 2322
	if (!gigaset_start(cs))
		goto error;

2323 2324
	return 0;

2325 2326
allocerr:
	dev_err(cs->dev, "could not allocate URBs\n");
2327 2328
error:
	freeurbs(cs);
2329
	usb_set_intfdata(interface, NULL);
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2330
	gigaset_freecs(cs);
2331 2332 2333 2334 2335 2336 2337 2338 2339 2340
	return -ENODEV;
}

/* gigaset_disconnect
 * This function is called when the Gigaset base is unplugged.
 */
static void gigaset_disconnect(struct usb_interface *interface)
{
	struct cardstate *cs;
	struct bas_cardstate *ucs;
2341
	int j;
2342 2343 2344 2345 2346

	cs = usb_get_intfdata(interface);

	ucs = cs->hw.bas;

2347
	dev_info(cs->dev, "disconnecting Gigaset base\n");
2348 2349

	/* mark base as not ready, all channels disconnected */
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2350
	ucs->basstate = 0;
2351 2352

	/* tell LL all channels are down */
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2353
	for (j = 0; j < BAS_CHANNELS; ++j)
2354 2355 2356
		gigaset_bchannel_down(cs->bcs + j);

	/* stop driver (common part) */
2357
	gigaset_stop(cs);
2358 2359 2360 2361 2362

	/* stop timers and URBs, free ressources */
	del_timer_sync(&ucs->timer_ctrl);
	del_timer_sync(&ucs->timer_atrdy);
	del_timer_sync(&ucs->timer_cmd_in);
2363
	freeurbs(cs);
2364
	usb_set_intfdata(interface, NULL);
2365 2366 2367
	kfree(ucs->rcvbuf);
	ucs->rcvbuf = NULL;
	ucs->rcvbuf_size = 0;
2368 2369 2370 2371
	usb_put_dev(ucs->udev);
	ucs->interface = NULL;
	ucs->udev = NULL;
	cs->dev = NULL;
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2372
	gigaset_freecs(cs);
2373 2374
}

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2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391
/* gigaset_suspend
 * This function is called before the USB connection is suspended.
 */
static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct cardstate *cs = usb_get_intfdata(intf);
	struct bas_cardstate *ucs = cs->hw.bas;
	int rc;

	/* set suspend flag; this stops AT command/response traffic */
	if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
		gig_dbg(DEBUG_SUSPEND, "already suspended");
		return 0;
	}

	/* wait a bit for blocking conditions to go away */
	rc = wait_event_timeout(ucs->waitqueue,
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2392
			!(ucs->basstate &
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2393 2394 2395 2396 2397
			  (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
			BAS_TIMEOUT*HZ/10);
	gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);

	/* check for conditions preventing suspend */
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2398
	if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
T
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2399
		dev_warn(cs->dev, "cannot suspend:\n");
T
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2400
		if (ucs->basstate & BS_B1OPEN)
T
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2401
			dev_warn(cs->dev, " B channel 1 open\n");
T
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2402
		if (ucs->basstate & BS_B2OPEN)
T
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2403
			dev_warn(cs->dev, " B channel 2 open\n");
T
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2404
		if (ucs->basstate & BS_ATRDPEND)
T
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2405
			dev_warn(cs->dev, " receiving AT reply\n");
T
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2406
		if (ucs->basstate & BS_ATWRPEND)
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2407 2408 2409 2410 2411 2412
			dev_warn(cs->dev, " sending AT command\n");
		update_basstate(ucs, 0, BS_SUSPEND);
		return -EBUSY;
	}

	/* close AT channel if open */
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2413
	if (ucs->basstate & BS_ATOPEN) {
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2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478
		gig_dbg(DEBUG_SUSPEND, "closing AT channel");
		rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
		if (rc) {
			update_basstate(ucs, 0, BS_SUSPEND);
			return rc;
		}
		wait_event_timeout(ucs->waitqueue, !ucs->pending,
				   BAS_TIMEOUT*HZ/10);
		/* in case of timeout, proceed anyway */
	}

	/* kill all URBs and timers that might still be pending */
	usb_kill_urb(ucs->urb_ctrl);
	usb_kill_urb(ucs->urb_int_in);
	del_timer_sync(&ucs->timer_ctrl);

	gig_dbg(DEBUG_SUSPEND, "suspend complete");
	return 0;
}

/* gigaset_resume
 * This function is called after the USB connection has been resumed.
 */
static int gigaset_resume(struct usb_interface *intf)
{
	struct cardstate *cs = usb_get_intfdata(intf);
	struct bas_cardstate *ucs = cs->hw.bas;
	int rc;

	/* resubmit interrupt URB for spontaneous messages from base */
	rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
	if (rc) {
		dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
			get_usb_rcmsg(rc));
		return rc;
	}

	/* clear suspend flag to reallow activity */
	update_basstate(ucs, 0, BS_SUSPEND);

	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)
{
	/* handle just like suspend */
	return gigaset_suspend(intf, PMSG_ON);
}

/* gigaset_post_reset
 * This function is called after the USB connection has been reset.
 */
static int gigaset_post_reset(struct usb_interface *intf)
{
	/* FIXME: send HD_DEVICE_INIT_ACK? */

	/* resume operations */
	return gigaset_resume(intf);
}


2479
static const struct gigaset_ops gigops = {
2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506
	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_isoc_send_skb,
	gigaset_isoc_input,
};

/* bas_gigaset_init
 * This function is called after the kernel module is loaded.
 */
static int __init bas_gigaset_init(void)
{
	int result;

	/* allocate memory for our driver state and intialize it */
	if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2507
				       GIGASET_MODULENAME, GIGASET_DEVNAME,
2508
				       &gigops, THIS_MODULE)) == NULL)
2509 2510 2511 2512 2513
		goto error;

	/* register this driver with the USB subsystem */
	result = usb_register(&gigaset_usb_driver);
	if (result < 0) {
2514
		pr_err("error %d registering USB driver\n", -result);
2515 2516 2517
		goto error;
	}

2518
	pr_info(DRIVER_DESC "\n");
2519 2520
	return 0;

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2521
error:
2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532
	if (driver)
		gigaset_freedriver(driver);
	driver = NULL;
	return -1;
}

/* bas_gigaset_exit
 * This function is called before the kernel module is unloaded.
 */
static void __exit bas_gigaset_exit(void)
{
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2533 2534
	struct bas_cardstate *ucs;
	int i;
2535

2536
	gigaset_blockdriver(driver); /* => probe will fail
2537 2538
				      * => no gigaset_start any more
				      */
2539

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2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569
	/* stop all connected devices */
	for (i = 0; i < driver->minors; i++) {
		if (gigaset_shutdown(driver->cs + i) < 0)
			continue;		/* no device */
		/* from now on, no isdn callback should be possible */

		/* close all still open channels */
		ucs = driver->cs[i].hw.bas;
		if (ucs->basstate & BS_B1OPEN) {
			gig_dbg(DEBUG_INIT, "closing B1 channel");
			usb_control_msg(ucs->udev,
					usb_sndctrlpipe(ucs->udev, 0),
					HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
					0, 0, NULL, 0, BAS_TIMEOUT);
		}
		if (ucs->basstate & BS_B2OPEN) {
			gig_dbg(DEBUG_INIT, "closing B2 channel");
			usb_control_msg(ucs->udev,
					usb_sndctrlpipe(ucs->udev, 0),
					HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
					0, 0, NULL, 0, BAS_TIMEOUT);
		}
		if (ucs->basstate & BS_ATOPEN) {
			gig_dbg(DEBUG_INIT, "closing AT channel");
			usb_control_msg(ucs->udev,
					usb_sndctrlpipe(ucs->udev, 0),
					HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
					0, 0, NULL, 0, BAS_TIMEOUT);
		}
		ucs->basstate = 0;
2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587
	}

	/* 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(bas_gigaset_init);
module_exit(bas_gigaset_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");