bas-gigaset.c 63.1 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>,
 *                       Stefan Eilers <Eilers.Stefan@epost.de>.
 *
 * Based on usb-gigaset.c.
 *
 * =====================================================================
 *	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 */
#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers <Eilers.Stefan@epost.de>"
#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_DEVFSNAME  "gig/bas/"
#define GIGASET_DEVNAME    "ttyGB"

#define IF_WRITEBUF 256 //FIXME

/* Values for the Gigaset 307x */
#define USB_GIGA_VENDOR_ID      0x0681
#define USB_GIGA_PRODUCT_ID     0x0001
#define USB_4175_PRODUCT_ID     0x0002
#define USB_SX303_PRODUCT_ID    0x0021
#define USB_SX353_PRODUCT_ID    0x0022

/* table of devices that work with this driver */
static struct usb_device_id gigaset_table [] = {
	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_GIGA_PRODUCT_ID) },
	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_4175_PRODUCT_ID) },
	{ 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);

/*======================= local function prototypes =============================*/

/* This function is called if a new device is connected to the USB port. It
 * checks whether this new device belongs to this driver.
 */
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);


/*==============================================================================*/

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 */

	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[3];

	spinlock_t		lock;		/* locks all following */
	atomic_t		basstate;	/* bitmap (BS_*) */
	int			pending;	/* uncompleted base request */
	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) */
#define BS_ATOPEN	0x001
#define BS_B1OPEN	0x002
#define BS_B2OPEN	0x004
#define BS_ATREADY	0x008
#define BS_INIT		0x010
#define BS_ATTIMER	0x020


static struct gigaset_driver *driver = NULL;
static struct cardstate *cardstate = 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,
};

/* 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:
		return "canceled";
	case -ECONNRESET:
		return "canceled (async)";
	case -EINPROGRESS:
		return "pending";
	case -EPROTO:
		return "bit stuffing or unknown USB error";
	case -EILSEQ:
		return "Illegal byte sequence (CRC mismatch)";
	case -EPIPE:
		return "babble detect or endpoint stalled";
	case -ENOSR:
		return "buffer error";
	case -ETIMEDOUT:
		return "timed out";
	case -ENODEV:
		return "device not present";
	case -EREMOTEIO:
		return "short packet detected";
	case -EXDEV:
		return "partial isochronous transfer";
	case -EINVAL:
		return "invalid argument";
	case -ENXIO:
		return "URB already queued";
	case -EAGAIN:
		return "isochronous start frame too early or too much scheduled";
	case -EFBIG:
		return "too many isochronous frames requested";
	case -EMSGSIZE:
		return "endpoint message size zero";
	case -ESHUTDOWN:
		return "endpoint shutdown";
	case -EBUSY:
		return "another request pending";
	default:
		snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", status);
		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;
	IFNULLRET(tag);
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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, "
			"status=%d, hcpriv=0x%08lx, transfer_flags=0x%x,",
			(unsigned long) urb->dev,
			usb_pipetype_str(urb->pipe),
			usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
			usb_pipein(urb->pipe) ? "in" : "out",
			urb->status, (unsigned long) urb->hcpriv,
			urb->transfer_flags);
		gig_dbg(level,
			"  transfer_buffer=0x%08lx[%d], actual_length=%d, "
			"bandwidth=%d, setup_packet=0x%08lx,",
			(unsigned long) urb->transfer_buffer,
			urb->transfer_buffer_length, urb->actual_length,
			urb->bandwidth, (unsigned long) urb->setup_packet);
		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.
 * 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)) {
		//FIXME what should we do?
		return;
	}

	gigaset_schedule_event(cs);
}

/* error_reset
 * reset Gigaset device 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.
 * argument:
 *	controller state structure
 */
static inline void error_reset(struct cardstate *cs)
{
	//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;

	IFNULLRET(ucs);

	spin_lock_irqsave(&ucs->lock, flags);
	switch (ucs->pending) {
	case 0:
		break;
	case HD_OPEN_ATCHANNEL:
		if (atomic_read(&ucs->basstate) & BS_ATOPEN)
			ucs->pending = 0;
		break;
	case HD_OPEN_B1CHANNEL:
		if (atomic_read(&ucs->basstate) & BS_B1OPEN)
			ucs->pending = 0;
		break;
	case HD_OPEN_B2CHANNEL:
		if (atomic_read(&ucs->basstate) & BS_B2OPEN)
			ucs->pending = 0;
		break;
	case HD_CLOSE_ATCHANNEL:
		if (!(atomic_read(&ucs->basstate) & BS_ATOPEN))
			ucs->pending = 0;
		break;
	case HD_CLOSE_B1CHANNEL:
		if (!(atomic_read(&ucs->basstate) & BS_B1OPEN))
			ucs->pending = 0;
		break;
	case HD_CLOSE_B2CHANNEL:
		if (!(atomic_read(&ucs->basstate) & BS_B2OPEN))
			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;
	struct bas_cardstate *ucs;
	unsigned long flags;

	IFNULLRET(cs);
	ucs = cs->hw.bas;
	IFNULLRET(ucs);

	spin_lock_irqsave(&cs->lock, flags);
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	if (unlikely(!atomic_read(&cs->connected))) {
		gig_dbg(DEBUG_USBREQ, "%s: disconnected", __func__);
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		spin_unlock_irqrestore(&cs->lock, flags);
		return;
	}
	if (!ucs->rcvbuf_size) {
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		gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
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		spin_unlock_irqrestore(&cs->lock, flags);
		return;
	}
	spin_unlock_irqrestore(&cs->lock, flags);

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	dev_err(cs->dev, "timeout reading AT response\n");
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	error_reset(cs);	//FIXME retry?
}


static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs);

/* atread_submit
 * submit an HD_READ_ATMESSAGE command URB
 * parameters:
 *	cs	controller state structure
 *	timeout	timeout in 1/10 sec., 0: none
 * return value:
 *	0 on success
 *	-EINVAL if a NULL pointer is encountered somewhere
 *	-EBUSY if another request is pending
 *	any URB submission error code
 */
static int atread_submit(struct cardstate *cs, int timeout)
{
	struct bas_cardstate *ucs;
	int ret;

	IFNULLRETVAL(cs, -EINVAL);
	ucs = cs->hw.bas;
	IFNULLRETVAL(ucs, -EINVAL);
	IFNULLRETVAL(ucs->urb_cmd_in, -EINVAL);

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	gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
		ucs->rcvbuf_size);
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	if (ucs->urb_cmd_in->status == -EINPROGRESS) {
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		dev_err(cs->dev,
			"could not submit HD_READ_ATMESSAGE: URB busy\n");
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		return -EBUSY;
	}

	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, SLAB_ATOMIC)) != 0) {
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		dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
			get_usb_statmsg(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;
}

static void stopurbs(struct bas_bc_state *);
static int start_cbsend(struct cardstate *);

/* set/clear bits in base connection state
 */
inline static void update_basstate(struct bas_cardstate *ucs,
				   int set, int clear)
{
	unsigned long flags;
	int state;

	spin_lock_irqsave(&ucs->lock, flags);
	state = atomic_read(&ucs->basstate);
	state &= ~clear;
	state |= set;
	atomic_set(&ucs->basstate, state);
	spin_unlock_irqrestore(&ucs->lock, flags);
}


/* 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
 */
static void read_int_callback(struct urb *urb, struct pt_regs *regs)
{
	struct cardstate *cs;
	struct bas_cardstate *ucs;
	struct bc_state *bcs;
	unsigned long flags;
	int status;
	unsigned l;
	int channel;

	IFNULLRET(urb);
	cs = (struct cardstate *) urb->context;
	IFNULLRET(cs);
	ucs = cs->hw.bas;
	IFNULLRET(ucs);

	if (unlikely(!atomic_read(&cs->connected))) {
		warn("%s: disconnected", __func__);
		return;
	}

	switch (urb->status) {
	case 0:			/* success */
		break;
	case -ENOENT:			/* canceled */
	case -ECONNRESET:		/* canceled (async) */
	case -EINPROGRESS:		/* pending */
		/* ignore silently */
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		gig_dbg(DEBUG_USBREQ, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
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		return;
	default:		/* severe trouble */
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		dev_warn(cs->dev, "interrupt read: %s\n",
			 get_usb_statmsg(urb->status));
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		//FIXME corrective action? resubmission always ok?
		goto resubmit;
	}

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

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	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]);
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	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,
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			   &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));
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		break;

	case HD_RECEIVEATDATA_ACK:	/* AT response ready to be received */
		if (!l) {
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			dev_warn(cs->dev,
				"HD_RECEIVEATDATA_ACK with length 0 ignored\n");
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			break;
		}
		spin_lock_irqsave(&cs->lock, flags);
		if (ucs->rcvbuf_size) {
			spin_unlock_irqrestore(&cs->lock, flags);
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			dev_err(cs->dev,
				"receive AT data overrun, %d bytes lost\n", l);
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			error_reset(cs);	//FIXME reschedule
			break;
		}
		if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
			spin_unlock_irqrestore(&cs->lock, flags);
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			dev_err(cs->dev, "out of memory, %d bytes lost\n", l);
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			error_reset(cs);	//FIXME reschedule
			break;
		}
		ucs->rcvbuf_size = l;
		ucs->retry_cmd_in = 0;
		if ((status = atread_submit(cs, BAS_TIMEOUT)) < 0) {
			kfree(ucs->rcvbuf);
			ucs->rcvbuf = NULL;
			ucs->rcvbuf_size = 0;
			error_reset(cs);	//FIXME reschedule
		}
		spin_unlock_irqrestore(&cs->lock, flags);
		break;

	case HD_RESET_INTERRUPT_PIPE_ACK:
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		gig_dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
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		break;

	case HD_SUSPEND_END:
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		gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
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		break;

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

	check_pending(ucs);

resubmit:
	status = usb_submit_urb(urb, SLAB_ATOMIC);
	if (unlikely(status)) {
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		dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
			get_usb_statmsg(status));
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		error_reset(cs);
	}
}

/* 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
 */
static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs)
{
	struct cardstate *cs;
	struct bas_cardstate *ucs;
	unsigned numbytes;
	unsigned long flags;
	struct inbuf_t *inbuf;
	int have_data = 0;

	IFNULLRET(urb);
	inbuf = (struct inbuf_t *) urb->context;
	IFNULLRET(inbuf);
	cs = inbuf->cs;
	IFNULLRET(cs);
	ucs = cs->hw.bas;
	IFNULLRET(ucs);

	spin_lock_irqsave(&cs->lock, flags);
657
	if (unlikely(!atomic_read(&cs->connected))) {
658 659 660 661 662 663
		warn("%s: disconnected", __func__);
		spin_unlock_irqrestore(&cs->lock, flags);
		return;
	}

	if (!ucs->rcvbuf_size) {
664
		dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
665 666 667 668 669 670 671 672 673 674
		spin_unlock_irqrestore(&cs->lock, flags);
		return;
	}

	del_timer(&ucs->timer_cmd_in);

	switch (urb->status) {
	case 0:				/* normal completion */
		numbytes = urb->actual_length;
		if (unlikely(numbytes == 0)) {
675 676
			dev_warn(cs->dev,
				 "control read: empty block received\n");
677 678 679
			goto retry;
		}
		if (unlikely(numbytes != ucs->rcvbuf_size)) {
680 681 682
			dev_warn(cs->dev,
			       "control read: received %d chars, expected %d\n",
				 numbytes, ucs->rcvbuf_size);
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
			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;
			goto retry;
		}
		break;

	case -ENOENT:			/* canceled */
	case -ECONNRESET:		/* canceled (async) */
	case -EINPROGRESS:		/* pending */
		/* no action necessary */
702 703
		gig_dbg(DEBUG_USBREQ, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
704 705 706
		break;

	default:			/* severe trouble */
707 708
		dev_warn(cs->dev, "control read: %s\n",
			 get_usb_statmsg(urb->status));
709 710
	retry:
		if (ucs->retry_cmd_in++ < BAS_RETRY) {
711 712
			dev_notice(cs->dev, "control read: retry %d\n",
				   ucs->retry_cmd_in);
713 714 715 716 717 718
			if (atread_submit(cs, BAS_TIMEOUT) >= 0) {
				/* resubmitted - bypass regular exit block */
				spin_unlock_irqrestore(&cs->lock, flags);
				return;
			}
		} else {
719 720 721
			dev_err(cs->dev,
				"control read: giving up after %d tries\n",
				ucs->retry_cmd_in);
722 723 724 725 726 727 728 729 730
		}
		error_reset(cs);
	}

	kfree(ucs->rcvbuf);
	ucs->rcvbuf = NULL;
	ucs->rcvbuf_size = 0;
	spin_unlock_irqrestore(&cs->lock, flags);
	if (have_data) {
731
		gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
		gigaset_schedule_event(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
 */
static void read_iso_callback(struct urb *urb, struct pt_regs *regs)
{
	struct bc_state *bcs;
	struct bas_bc_state *ubc;
	unsigned long flags;
	int i, rc;

	IFNULLRET(urb);
	IFNULLRET(urb->context);
	IFNULLRET(cardstate);

	/* status codes not worth bothering the tasklet with */
	if (unlikely(urb->status == -ENOENT || urb->status == -ECONNRESET ||
756 757 758
		     urb->status == -EINPROGRESS)) {
		gig_dbg(DEBUG_ISO, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783
		return;
	}

	bcs = (struct bc_state *) urb->context;
	ubc = bcs->hw.bas;
	IFNULLRET(ubc);

	spin_lock_irqsave(&ubc->isoinlock, flags);
	if (likely(ubc->isoindone == NULL)) {
		/* pass URB to tasklet */
		ubc->isoindone = urb;
		tasklet_schedule(&ubc->rcvd_tasklet);
	} else {
		/* tasklet still busy, drop data and resubmit URB */
		ubc->loststatus = urb->status;
		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 &&
				     urb->iso_frame_desc[i].status != -EINPROGRESS)) {
				ubc->loststatus = urb->iso_frame_desc[i].status;
			}
			urb->iso_frame_desc[i].status = 0;
			urb->iso_frame_desc[i].actual_length = 0;
		}
		if (likely(atomic_read(&ubc->running))) {
784 785
			/* urb->dev is clobbered by USB subsystem */
			urb->dev = bcs->cs->hw.bas->udev;
786 787
			urb->transfer_flags = URB_ISO_ASAP;
			urb->number_of_packets = BAS_NUMFRAMES;
788 789
			gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
				__func__);
790 791
			rc = usb_submit_urb(urb, SLAB_ATOMIC);
			if (unlikely(rc != 0)) {
792 793 794
				dev_err(bcs->cs->dev,
					"could not resubmit isochronous read "
					"URB: %s\n", get_usb_statmsg(rc));
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
				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
 */
static void write_iso_callback(struct urb *urb, struct pt_regs *regs)
{
	struct isow_urbctx_t *ucx;
	struct bas_bc_state *ubc;
	unsigned long flags;

	IFNULLRET(urb);
	IFNULLRET(urb->context);
	IFNULLRET(cardstate);

	/* status codes not worth bothering the tasklet with */
	if (unlikely(urb->status == -ENOENT || urb->status == -ECONNRESET ||
822 823 824
		     urb->status == -EINPROGRESS)) {
		gig_dbg(DEBUG_ISO, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
		return;
	}

	/* pass URB context to tasklet */
	ucx = (struct isow_urbctx_t *) urb->context;
	IFNULLRET(ucx->bcs);
	ubc = ucx->bcs->hw.bas;
	IFNULLRET(ubc);

	spin_lock_irqsave(&ubc->isooutlock, flags);
	ubc->isooutovfl = ubc->isooutdone;
	ubc->isooutdone = ucx;
	spin_unlock_irqrestore(&ubc->isooutlock, flags);
	tasklet_schedule(&ubc->sent_tasklet);
}

/* 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)
{
	struct urb *urb;
	struct bas_bc_state *ubc;
	int j, k;
	int rc;

	IFNULLRETVAL(bcs, -EFAULT);
	ubc = bcs->hw.bas;
	IFNULLRETVAL(ubc, -EFAULT);

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

	/* submit all isochronous input URBs */
	atomic_set(&ubc->running, 1);
	for (k = 0; k < BAS_INURBS; k++) {
		urb = ubc->isoinurbs[k];
		if (!urb) {
869
			dev_err(bcs->cs->dev, "isoinurbs[%d]==NULL\n", k);
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
			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);
		if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
892 893 894
			dev_err(bcs->cs->dev,
			       "could not submit isochronous read URB %d: %s\n",
				k, get_usb_statmsg(rc));
895 896 897 898 899 900 901 902 903 904 905
			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) {
906
			dev_err(bcs->cs->dev, "isoouturbs[%d].urb==NULL\n", k);
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932
			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;
	}

	/* submit two URBs, keep third one */
	for (k = 0; k < 2; ++k) {
		dump_urb(DEBUG_ISO, "Initial isoc write", urb);
		rc = usb_submit_urb(ubc->isoouturbs[k].urb, SLAB_ATOMIC);
		if (rc != 0) {
933 934 935
			dev_err(bcs->cs->dev,
			      "could not submit isochronous write URB %d: %s\n",
				k, get_usb_statmsg(rc));
936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
			goto error;
		}
	}
	dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
	ubc->isooutfree = &ubc->isoouturbs[2];
	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;

	IFNULLRET(ubc);

	atomic_set(&ubc->running, 0);

	for (k = 0; k < BAS_INURBS; ++k) {
		rc = usb_unlink_urb(ubc->isoinurbs[k]);
964 965 966
		gig_dbg(DEBUG_ISO,
			"%s: isoc input URB %d unlinked, result = %d",
			__func__, k, rc);
967 968 969 970
	}

	for (k = 0; k < BAS_OUTURBS; ++k) {
		rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
971 972 973
		gig_dbg(DEBUG_ISO,
			"%s: isoc output URB %d unlinked, result = %d",
			__func__, k, rc);
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
	}
}

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

/* submit_iso_write_urb
 * fill and submit the next isochronous write URB
 * parameters:
 *	bcs	B channel state structure
 * 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)
{
	struct urb *urb;
	struct bas_bc_state *ubc;
	struct usb_iso_packet_descriptor *ifd;
	int corrbytes, nframe, rc;

	IFNULLRETVAL(ucx, -EFAULT);
	urb = ucx->urb;
	IFNULLRETVAL(urb, -EFAULT);
	IFNULLRETVAL(ucx->bcs, -EFAULT);
	ubc = ucx->bcs->hw.bas;
	IFNULLRETVAL(ubc, -EFAULT);

1003 1004
	/* urb->dev is clobbered by USB subsystem */
	urb->dev = ucx->bcs->cs->hw.bas->udev;
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
	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) {
1015 1016
			gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
				__func__, corrbytes);
1017 1018 1019 1020 1021 1022 1023 1024 1025
			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 */
1026 1027
		ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf,
						       ifd->length);
1028 1029
		if (ifd->offset < 0) {
			if (ifd->offset == -EBUSY) {
1030 1031 1032 1033 1034
				gig_dbg(DEBUG_ISO,
					"%s: buffer busy at frame %d",
					__func__, nframe);
				/* tasklet will be restarted from
				   gigaset_send_skb() */
1035
			} else {
1036 1037 1038
				dev_err(ucx->bcs->cs->dev,
					"%s: buffer error %d at frame %d\n",
					__func__, ifd->offset, nframe);
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
				return ifd->offset;
			}
			break;
		}
		ucx->limit = atomic_read(&ubc->isooutbuf->nextread);
		ifd->status = 0;
		ifd->actual_length = 0;
	}
	if ((urb->number_of_packets = nframe) > 0) {
		if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
1049 1050 1051
			dev_err(ucx->bcs->cs->dev,
				"could not submit isochronous write URB: %s\n",
				get_usb_statmsg(rc));
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
			dump_urb(DEBUG_ISO, "isoc write", urb);
			return rc;
		}
		++ubc->numsub;
	}
	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)
{
	struct bc_state *bcs;
	struct bas_bc_state *ubc;
	struct cardstate *cs;
	struct isow_urbctx_t *done, *next, *ovfl;
	struct urb *urb;
	struct usb_iso_packet_descriptor *ifd;
	int offset;
	unsigned long flags;
	int i;
	struct sk_buff *skb;
	int len;

	bcs = (struct bc_state *) data;
	IFNULLRET(bcs);
	ubc = bcs->hw.bas;
	IFNULLRET(ubc);
	cs = bcs->cs;
	IFNULLRET(cs);

	/* loop while completed URBs arrive in time */
	for (;;) {
		if (unlikely(!atomic_read(&cs->connected))) {
			warn("%s: disconnected", __func__);
			return;
		}

		if (unlikely(!(atomic_read(&ubc->running)))) {
1095
			gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
			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) {
1107
			dev_err(cs->dev, "isochronous write buffer underrun\n");
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
			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) {
			if (submit_iso_write_urb(next) <= 0) {
				/* 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 */
1130 1131
					dev_err(cs->dev,
					      "losing isochronous write URB\n");
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143
					error_hangup(bcs);
				}
			}
		}

		/* process completed URB */
		urb = done->urb;
		switch (urb->status) {
		case 0:				/* normal completion */
			break;
		case -EXDEV:			/* inspect individual frames */
			/* assumptions (for lack of documentation):
1144 1145
			 * - actual_length bytes of the frame in error are
			 *   successfully sent
1146 1147
			 * - all following frames are not sent at all
			 */
1148 1149
			gig_dbg(DEBUG_ISO, "%s: URB partially completed",
				__func__);
1150 1151 1152 1153 1154
			offset = done->limit;	/* just in case */
			for (i = 0; i < BAS_NUMFRAMES; i++) {
				ifd = &urb->iso_frame_desc[i];
				if (ifd->status ||
				    ifd->actual_length != ifd->length) {
1155 1156 1157
					dev_warn(cs->dev,
					     "isochronous write: frame %d: %s, "
					     "only %d of %d bytes sent\n",
1158 1159 1160
					     i, get_usb_statmsg(ifd->status),
					     ifd->actual_length, ifd->length);
					offset = (ifd->offset +
1161 1162
						  ifd->actual_length)
						 % BAS_OUTBUFSIZE;
1163 1164 1165 1166 1167 1168 1169 1170 1171
					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) {
1172 1173 1174
					dev_warn(cs->dev,
					     "isochronous write: frame %d: %s, "
					     "%d of %d bytes sent\n",
1175 1176 1177
					     i, get_usb_statmsg(ifd->status),
					     ifd->actual_length, ifd->length);
					offset = (ifd->offset +
1178 1179
						  ifd->actual_length)
						 % BAS_OUTBUFSIZE;
1180 1181 1182 1183 1184
					break;
				}
			}
#endif
			break;
1185 1186
		case -EPIPE:		//FIXME is this the code for "underrun"?
			dev_err(cs->dev, "isochronous write stalled\n");
1187 1188 1189
			error_hangup(bcs);
			break;
		default:			/* severe trouble */
1190 1191
			dev_warn(cs->dev, "isochronous write: %s\n",
				 get_usb_statmsg(urb->status));
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
		}

		/* mark the write buffer area covered by this URB as free */
		if (done->limit >= 0)
			atomic_set(&ubc->isooutbuf->read, done->limit);

		/* 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 */
			if (submit_iso_write_urb(next) <= 0) {
				/* 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);
1219 1220
			gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
				__func__, skb_queue_len(&bcs->squeue));
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
			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)
{
	struct bc_state *bcs;
	struct bas_bc_state *ubc;
	struct cardstate *cs;
	struct urb *urb;
	char *rcvbuf;
	unsigned long flags;
	int totleft, numbytes, offset, frame, rc;

	bcs = (struct bc_state *) data;
	IFNULLRET(bcs);
	ubc = bcs->hw.bas;
	IFNULLRET(ubc);
	cs = bcs->cs;
	IFNULLRET(cs);

	/* loop while more completed URBs arrive in the meantime */
	for (;;) {
1257
		if (unlikely(!atomic_read(&cs->connected))) {
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269
			warn("%s: disconnected", __func__);
			return;
		}

		/* retrieve URB */
		spin_lock_irqsave(&ubc->isoinlock, flags);
		if (!(urb = ubc->isoindone)) {
			spin_unlock_irqrestore(&ubc->isoinlock, flags);
			return;
		}
		ubc->isoindone = NULL;
		if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1270 1271 1272 1273 1274
			dev_warn(cs->dev,
				 "isochronous read overrun, "
				 "dropped URB with status: %s, %d bytes lost\n",
				 get_usb_statmsg(ubc->loststatus),
				 ubc->isoinlost);
1275 1276 1277 1278 1279
			ubc->loststatus = -EINPROGRESS;
		}
		spin_unlock_irqrestore(&ubc->isoinlock, flags);

		if (unlikely(!(atomic_read(&ubc->running)))) {
1280 1281 1282 1283
			gig_dbg(DEBUG_ISO,
				"%s: channel not running, "
				"dropped URB with status: %s",
				__func__, get_usb_statmsg(urb->status));
1284 1285 1286 1287 1288 1289
			return;
		}

		switch (urb->status) {
		case 0:				/* normal completion */
			break;
1290 1291
		case -EXDEV:			/* inspect individual frames
						   (we do that anyway) */
1292 1293
			gig_dbg(DEBUG_ISO, "%s: URB partially completed",
				__func__);
1294 1295 1296
			break;
		case -ENOENT:
		case -ECONNRESET:
1297
			gig_dbg(DEBUG_ISO, "%s: URB canceled", __func__);
1298 1299
			continue;		/* -> skip */
		case -EINPROGRESS:		/* huh? */
1300
			gig_dbg(DEBUG_ISO, "%s: URB still pending", __func__);
1301 1302
			continue;		/* -> skip */
		case -EPIPE:
1303
			dev_err(cs->dev, "isochronous read stalled\n");
1304 1305 1306
			error_hangup(bcs);
			continue;		/* -> skip */
		default:			/* severe trouble */
1307 1308
			dev_warn(cs->dev, "isochronous read: %s\n",
				 get_usb_statmsg(urb->status));
1309 1310 1311 1312 1313 1314 1315
			goto error;
		}

		rcvbuf = urb->transfer_buffer;
		totleft = urb->actual_length;
		for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
			if (unlikely(urb->iso_frame_desc[frame].status)) {
1316 1317 1318 1319 1320
				dev_warn(cs->dev,
					 "isochronous read: frame %d: %s\n",
					 frame,
					 get_usb_statmsg(
					    urb->iso_frame_desc[frame].status));
1321 1322 1323 1324
				break;
			}
			numbytes = urb->iso_frame_desc[frame].actual_length;
			if (unlikely(numbytes > BAS_MAXFRAME)) {
1325 1326 1327 1328
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "numbytes (%d) > BAS_MAXFRAME\n",
					 frame, numbytes);
1329 1330 1331
				break;
			}
			if (unlikely(numbytes > totleft)) {
1332 1333 1334 1335
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "numbytes (%d) > totleft (%d)\n",
					 frame, numbytes, totleft);
1336 1337 1338 1339
				break;
			}
			offset = urb->iso_frame_desc[frame].offset;
			if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1340 1341 1342 1343 1344
				dev_warn(cs->dev,
					 "isochronous read: frame %d: "
					 "offset (%d) + numbytes (%d) "
					 "> BAS_INBUFSIZE\n",
					 frame, offset, numbytes);
1345 1346 1347 1348 1349 1350
				break;
			}
			gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
			totleft -= numbytes;
		}
		if (unlikely(totleft > 0))
1351 1352 1353
			dev_warn(cs->dev,
				 "isochronous read: %d data bytes missing\n",
				 totleft);
1354 1355 1356 1357 1358 1359 1360

	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;
		}
1361 1362
		/* urb->dev is clobbered by USB subsystem */
		urb->dev = bcs->cs->hw.bas->udev;
1363 1364 1365
		urb->transfer_flags = URB_ISO_ASAP;
		urb->number_of_packets = BAS_NUMFRAMES;
		if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
1366 1367 1368
			dev_err(cs->dev,
				"could not resubmit isochronous read URB: %s\n",
				get_usb_statmsg(rc));
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403
			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;
	struct bas_cardstate *ucs;
	int pending;
	unsigned long flags;

	IFNULLRET(bcs);
	IFNULLRET(bcs->cs);
	ucs = bcs->cs->hw.bas;
	IFNULLRET(ucs);

	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 */
1404
		gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1405 1406 1407
		break;

	case HD_OPEN_ATCHANNEL:
1408
		dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1409 1410 1411 1412 1413
		error_reset(bcs->cs);
		break;

	case HD_OPEN_B2CHANNEL:
	case HD_OPEN_B1CHANNEL:
1414 1415
		dev_err(bcs->cs->dev, "timeout opening channel %d\n",
			bcs->channel + 1);
1416 1417 1418 1419
		error_hangup(bcs);
		break;

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

	case HD_CLOSE_B2CHANNEL:
	case HD_CLOSE_B1CHANNEL:
1425 1426
		dev_err(bcs->cs->dev, "timeout closing channel %d\n",
			bcs->channel + 1);
1427 1428 1429
		break;

	default:
1430 1431
		dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
			 pending);
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
	}
}

/* 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
 */
static void write_ctrl_callback(struct urb *urb, struct pt_regs *regs)
{
	struct bas_cardstate *ucs;
	unsigned long flags;

	IFNULLRET(urb);
	IFNULLRET(urb->context);
	IFNULLRET(cardstate);

	ucs = (struct bas_cardstate *) urb->context;
	spin_lock_irqsave(&ucs->lock, flags);
	if (urb->status && ucs->pending) {
1454 1455 1456
		dev_err(&ucs->interface->dev,
			"control request 0x%02x failed: %s\n",
			ucs->pending, get_usb_statmsg(urb->status));
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491