bas-gigaset.c 64.5 KB
Newer Older
1 2 3 4 5
/*
 * USB driver for Gigaset 307x base via direct USB connection.
 *
 * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
 *                       Tilman Schmidt <tilman@imap.cc>,
6
 *                       Stefan Eilers.
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
 *
 * =====================================================================
 *	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 */
27
#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
#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"

46 47
/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
#define IF_WRITEBUF 264
48 49 50

/* Values for the Gigaset 307x */
#define USB_GIGA_VENDOR_ID      0x0681
51 52
#define USB_3070_PRODUCT_ID     0x0001
#define USB_3075_PRODUCT_ID     0x0002
53 54 55 56 57
#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 [] = {
58 59
	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
	{ USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
60 61 62 63 64 65 66
	{ 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);

67
/*======================= local function prototypes ==========================*/
68

69
/* function called if a new device belonging to this driver is connected */
70 71 72 73 74 75
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);

76
static int atread_submit(struct cardstate *, int);
77
static void stopurbs(struct bas_bc_state *);
78
static int req_submit(struct bc_state *, int, int, int);
79 80
static int atwrite_submit(struct cardstate *, unsigned char *, int);
static int start_cbsend(struct cardstate *);
81

82
/*============================================================================*/
83 84

struct bas_cardstate {
85 86
	struct usb_device	*udev;		/* USB device pointer */
	struct usb_interface	*interface;	/* interface for this device */
87 88
	unsigned char		minor;		/* starting minor number */

89
	struct urb		*urb_ctrl;	/* control pipe default URB */
90 91
	struct usb_ctrlrequest	dr_ctrl;
	struct timer_list	timer_ctrl;	/* control request timeout */
92
	int			retry_ctrl;
93 94

	struct timer_list	timer_atrdy;	/* AT command ready timeout */
95
	struct urb		*urb_cmd_out;	/* for sending AT commands */
96 97 98
	struct usb_ctrlrequest	dr_cmd_out;
	int			retry_cmd_out;

99
	struct urb		*urb_cmd_in;	/* for receiving AT replies */
100 101
	struct usb_ctrlrequest	dr_cmd_in;
	struct timer_list	timer_cmd_in;	/* receive request timeout */
102
	unsigned char		*rcvbuf;	/* AT reply receive buffer */
103

104
	struct urb		*urb_int_in;	/* URB for interrupt pipe */
105 106 107 108 109 110 111 112 113 114 115
	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) */
116 117 118 119 120 121 122 123
#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 */
124 125 126 127 128 129 130 131 132 133 134 135 136


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,
};

137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177
/* 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;
	}
}

178 179 180 181 182 183 184 185 186 187
/* 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:
188
		return "unlinked (sync)";
189 190 191
	case -EINPROGRESS:
		return "pending";
	case -EPROTO:
192
		return "bit stuffing error, timeout, or unknown USB error";
193
	case -EILSEQ:
194
		return "CRC mismatch, timeout, or unknown USB error";
195
	case -ETIME:
196
		return "timed out";
197 198 199 200 201 202 203 204
	case -EPIPE:
		return "endpoint stalled";
	case -ECOMM:
		return "IN buffer overrun";
	case -ENOSR:
		return "OUT buffer underrun";
	case -EOVERFLOW:
		return "too much data";
205 206
	case -EREMOTEIO:
		return "short packet detected";
207 208
	case -ENODEV:
		return "device removed";
209 210 211 212
	case -EXDEV:
		return "partial isochronous transfer";
	case -EINVAL:
		return "invalid argument";
213 214
	case -ECONNRESET:
		return "unlinked (async)";
215
	case -ESHUTDOWN:
216
		return "device shut down";
217
	default:
218
		snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
		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,
243
			    struct urb *urb)
244 245 246
{
#ifdef CONFIG_GIGASET_DEBUG
	int i;
247
	gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
248
	if (urb) {
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
		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);
274
		for (i = 0; i < urb->number_of_packets; i++) {
275 276
			struct usb_iso_packet_descriptor *pifd
				= &urb->iso_frame_desc[i];
277 278 279 280 281
			gig_dbg(level,
				"    {offset=%u, length=%u, actual_length=%u, "
				"status=%u}",
				pifd->offset, pifd->length, pifd->actual_length,
				pifd->status);
282 283
		}
	}
284
	gig_dbg(level, "}}");
285 286 287 288 289
#endif
}

/* read/set modem control bits etc. (m10x only) */
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
290
				  unsigned new_state)
291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308
{
	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.
309
 * cs->lock must not be held.
310 311 312 313 314 315 316
 * argument:
 *	B channel control structure
 */
static inline void error_hangup(struct bc_state *bcs)
{
	struct cardstate *cs = bcs->cs;

317 318
	gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
		__func__, bcs->channel);
319

320 321
	if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
		dev_err(cs->dev, "event queue full\n");
322 323 324 325 326 327

	gigaset_schedule_event(cs);
}

/* error_reset
 * reset Gigaset device because of an unrecoverable error
328
 * This function may be called from any context, and takes care of
329
 * scheduling the necessary actions for execution outside of interrupt context.
330
 * cs->lock must not be held.
331 332 333 334 335
 * argument:
 *	controller state structure
 */
static inline void error_reset(struct cardstate *cs)
{
336 337 338
	/* close AT command channel to recover (ignore errors) */
	req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);

339
	//FIXME try to recover without bothering the user
340 341
	dev_err(cs->dev,
	    "unrecoverable error - please disconnect Gigaset base to reset\n");
342 343 344 345 346
}

/* check_pending
 * check for completion of pending control request
 * parameter:
347
 *	ucs	hardware specific controller state structure
348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387
 */
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:
		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:
388 389 390
		dev_warn(&ucs->interface->dev,
			 "unknown pending request 0x%02x cleared\n",
			 ucs->pending);
391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407
		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;
408
	struct bas_cardstate *ucs = cs->hw.bas;
409
	int rc;
410 411

	if (!ucs->rcvbuf_size) {
412
		gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
413 414 415
		return;
	}

416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432
	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);
433 434
}

435 436 437 438 439 440 441
/* 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;
442

443 444 445 446 447 448
	spin_lock_irqsave(&ucs->lock, flags);
	state = atomic_read(&ucs->basstate);
	atomic_set(&ucs->basstate, (state & ~clear) | set);
	spin_unlock_irqrestore(&ucs->lock, flags);
	return state;
}
449

450 451 452 453 454 455 456
/* 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
 */
457
static void read_ctrl_callback(struct urb *urb)
458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539
{
	struct inbuf_t *inbuf = urb->context;
	struct cardstate *cs = inbuf->cs;
	struct bas_cardstate *ucs = cs->hw.bas;
	int have_data = 0;
	unsigned numbytes;
	int rc;

	update_basstate(ucs, 0, BS_ATRDPEND);

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

	del_timer(&ucs->timer_cmd_in);

	switch (urb->status) {
	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",
			__func__, get_usb_statmsg(urb->status));
		break;

	default:			/* severe trouble */
		dev_warn(cs->dev, "control read: %s\n",
			 get_usb_statmsg(urb->status));
		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);
	}
}

540
/* atread_submit
541
 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
542 543 544 545 546 547 548 549 550 551
 * 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)
{
552
	struct bas_cardstate *ucs = cs->hw.bas;
553 554
	int ret;

555 556
	gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
		ucs->rcvbuf_size);
557

558
	if (update_basstate(ucs, BS_ATRDPEND, 0) & BS_ATRDPEND) {
559 560
		dev_err(cs->dev,
			"could not submit HD_READ_ATMESSAGE: URB busy\n");
561 562 563 564 565 566 567 568 569
		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,
570 571 572 573
			     usb_rcvctrlpipe(ucs->udev, 0),
			     (unsigned char*) & ucs->dr_cmd_in,
			     ucs->rcvbuf, ucs->rcvbuf_size,
			     read_ctrl_callback, cs->inbuf);
574

575
	if ((ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC)) != 0) {
576
		update_basstate(ucs, 0, BS_ATRDPEND);
577
		dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
578
			get_usb_rcmsg(ret));
579 580 581 582
		return ret;
	}

	if (timeout > 0) {
583
		gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598
		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
 */
599
static void read_int_callback(struct urb *urb)
600
{
601 602
	struct cardstate *cs = urb->context;
	struct bas_cardstate *ucs = cs->hw.bas;
603 604
	struct bc_state *bcs;
	unsigned long flags;
605
	int rc;
606 607 608 609 610 611
	unsigned l;
	int channel;

	switch (urb->status) {
	case 0:			/* success */
		break;
612 613
	case -ENOENT:			/* cancelled */
	case -ECONNRESET:		/* cancelled (async) */
614 615
	case -EINPROGRESS:		/* pending */
		/* ignore silently */
616 617
		gig_dbg(DEBUG_USBREQ, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
618
		return;
619 620 621 622 623
	case -ENODEV:			/* device removed */
	case -ESHUTDOWN:		/* device shut down */
		//FIXME use this as disconnect indicator?
		gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
		return;
624
	default:		/* severe trouble */
625 626
		dev_warn(cs->dev, "interrupt read: %s\n",
			 get_usb_statmsg(urb->status));
627 628 629 630
		//FIXME corrective action? resubmission always ok?
		goto resubmit;
	}

631 632 633 634 635 636 637
	/* drop incomplete packets even if the missing bytes wouldn't matter */
	if (unlikely(urb->actual_length < 3)) {
		dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
			 urb->actual_length);
		goto resubmit;
	}

638 639 640
	l = (unsigned) ucs->int_in_buf[1] +
	    (((unsigned) ucs->int_in_buf[2]) << 8);

641 642 643
	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]);
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688

	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,
689 690 691 692 693
			   &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));
694 695 696 697
		break;

	case HD_RECEIVEATDATA_ACK:	/* AT response ready to be received */
		if (!l) {
698 699
			dev_warn(cs->dev,
				"HD_RECEIVEATDATA_ACK with length 0 ignored\n");
700 701 702 703
			break;
		}
		spin_lock_irqsave(&cs->lock, flags);
		if (ucs->rcvbuf_size) {
704
			/* throw away previous buffer - we have no queue */
705
			dev_err(cs->dev,
706 707 708 709
				"receive AT data overrun, %d bytes lost\n",
				ucs->rcvbuf_size);
			kfree(ucs->rcvbuf);
			ucs->rcvbuf_size = 0;
710 711 712
		}
		if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
			spin_unlock_irqrestore(&cs->lock, flags);
713 714
			dev_err(cs->dev, "out of memory receiving AT data\n");
			error_reset(cs);
715 716 717 718
			break;
		}
		ucs->rcvbuf_size = l;
		ucs->retry_cmd_in = 0;
719
		if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {
720 721 722
			kfree(ucs->rcvbuf);
			ucs->rcvbuf = NULL;
			ucs->rcvbuf_size = 0;
723
			if (rc != -ENODEV) {
724
				//FIXME corrective action?
725
				spin_unlock_irqrestore(&cs->lock, flags);
726
				error_reset(cs);
727 728
				break;
			}
729 730 731 732 733
		}
		spin_unlock_irqrestore(&cs->lock, flags);
		break;

	case HD_RESET_INTERRUPT_PIPE_ACK:
734
		gig_dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
735 736 737
		break;

	case HD_SUSPEND_END:
738
		gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
739 740 741
		break;

	default:
742 743 744
		dev_warn(cs->dev,
			 "unknown Gigaset signal 0x%02x (%u) ignored\n",
			 (int) ucs->int_in_buf[0], l);
745 746 747 748 749
	}

	check_pending(ucs);

resubmit:
750
	rc = usb_submit_urb(urb, GFP_ATOMIC);
751
	if (unlikely(rc != 0 && rc != -ENODEV)) {
752
		dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
753
			get_usb_rcmsg(rc));
754 755 756 757 758 759 760 761 762 763 764
		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
 */
765
static void read_iso_callback(struct urb *urb)
766 767 768 769 770 771 772
{
	struct bc_state *bcs;
	struct bas_bc_state *ubc;
	unsigned long flags;
	int i, rc;

	/* status codes not worth bothering the tasklet with */
773 774 775 776 777
	if (unlikely(urb->status == -ENOENT ||
		     urb->status == -ECONNRESET ||
		     urb->status == -EINPROGRESS ||
		     urb->status == -ENODEV ||
		     urb->status == -ESHUTDOWN)) {
778 779
		gig_dbg(DEBUG_ISO, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
780 781 782
		return;
	}

783
	bcs = urb->context;
784 785 786 787 788 789 790 791 792 793 794 795 796
	ubc = bcs->hw.bas;

	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 &&
797 798
				     urb->iso_frame_desc[i].status !=
								-EINPROGRESS))
799 800 801 802 803
				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))) {
804 805
			/* urb->dev is clobbered by USB subsystem */
			urb->dev = bcs->cs->hw.bas->udev;
806 807
			urb->transfer_flags = URB_ISO_ASAP;
			urb->number_of_packets = BAS_NUMFRAMES;
808 809
			gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
				__func__);
810
			rc = usb_submit_urb(urb, GFP_ATOMIC);
811
			if (unlikely(rc != 0 && rc != -ENODEV)) {
812 813
				dev_err(bcs->cs->dev,
					"could not resubmit isochronous read "
814
					"URB: %s\n", get_usb_rcmsg(rc));
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829
				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
 */
830
static void write_iso_callback(struct urb *urb)
831 832 833 834 835 836
{
	struct isow_urbctx_t *ucx;
	struct bas_bc_state *ubc;
	unsigned long flags;

	/* status codes not worth bothering the tasklet with */
837 838 839 840 841
	if (unlikely(urb->status == -ENOENT ||
		     urb->status == -ECONNRESET ||
		     urb->status == -EINPROGRESS ||
		     urb->status == -ENODEV ||
		     urb->status == -ESHUTDOWN)) {
842 843
		gig_dbg(DEBUG_ISO, "%s: %s",
			__func__, get_usb_statmsg(urb->status));
844 845 846 847
		return;
	}

	/* pass URB context to tasklet */
848
	ucx = urb->context;
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
	ubc = ucx->bcs->hw.bas;

	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)
{
868
	struct bas_bc_state *ubc = bcs->hw.bas;
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
	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 */
	atomic_set(&ubc->running, 1);
	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);
903
		if ((rc = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937
			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;
	}

	/* submit two URBs, keep third one */
	for (k = 0; k < 2; ++k) {
		dump_urb(DEBUG_ISO, "Initial isoc write", urb);
938
		rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
939
		if (rc != 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
			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;

	atomic_set(&ubc->running, 0);

	for (k = 0; k < BAS_INURBS; ++k) {
		rc = usb_unlink_urb(ubc->isoinurbs[k]);
965
		gig_dbg(DEBUG_ISO,
966 967
			"%s: isoc input URB %d unlinked, result = %s",
			__func__, k, get_usb_rcmsg(rc));
968 969 970 971
	}

	for (k = 0; k < BAS_OUTURBS; ++k) {
		rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
972
		gig_dbg(DEBUG_ISO,
973 974
			"%s: isoc output URB %d unlinked, result = %s",
			__func__, k, get_usb_rcmsg(rc));
975 976 977 978 979 980 981 982 983
	}
}

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

/* submit_iso_write_urb
 * fill and submit the next isochronous write URB
 * parameters:
984
 *	ucx	context structure containing URB
985 986 987 988 989 990 991
 * 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)
{
992 993
	struct urb *urb = ucx->urb;
	struct bas_bc_state *ubc = ucx->bcs->hw.bas;
994 995 996
	struct usb_iso_packet_descriptor *ifd;
	int corrbytes, nframe, rc;

997 998
	/* urb->dev is clobbered by USB subsystem */
	urb->dev = ucx->bcs->cs->hw.bas->udev;
999 1000 1001 1002 1003 1004 1005 1006 1007 1008
	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) {
1009 1010
			gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
				__func__, corrbytes);
1011 1012 1013 1014 1015 1016 1017 1018 1019
			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 */
1020 1021
		ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf,
						       ifd->length);
1022 1023
		if (ifd->offset < 0) {
			if (ifd->offset == -EBUSY) {
1024 1025 1026 1027 1028
				gig_dbg(DEBUG_ISO,
					"%s: buffer busy at frame %d",
					__func__, nframe);
				/* tasklet will be restarted from
				   gigaset_send_skb() */
1029
			} else {
1030 1031 1032
				dev_err(ucx->bcs->cs->dev,
					"%s: buffer error %d at frame %d\n",
					__func__, ifd->offset, nframe);
1033 1034 1035 1036 1037 1038 1039 1040
				return ifd->offset;
			}
			break;
		}
		ucx->limit = atomic_read(&ubc->isooutbuf->nextread);
		ifd->status = 0;
		ifd->actual_length = 0;
	}
1041 1042 1043
	if (unlikely(nframe == 0))
		return 0;	/* no data to send */
	urb->number_of_packets = nframe;
1044

1045
	rc = usb_submit_urb(urb, GFP_ATOMIC);
1046 1047 1048 1049 1050
	if (unlikely(rc)) {
		if (rc == -ENODEV)
			/* device removed - give up silently */
			gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
		else
1051 1052
			dev_err(ucx->bcs->cs->dev,
				"could not submit isochronous write URB: %s\n",
1053 1054
				get_usb_rcmsg(rc));
		return rc;
1055
	}
1056
	++ubc->numsub;
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
	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)
{
1068 1069 1070
	struct bc_state *bcs = (struct bc_state *) data;
	struct bas_bc_state *ubc = bcs->hw.bas;
	struct cardstate *cs = bcs->cs;
1071 1072 1073 1074 1075 1076 1077 1078
	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;
1079
	int rc;
1080 1081 1082 1083

	/* loop while completed URBs arrive in time */
	for (;;) {
		if (unlikely(!(atomic_read(&ubc->running)))) {
1084
			gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
			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) {
1096
			dev_err(cs->dev, "isochronous write buffer underrun\n");
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
			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) {
1109 1110
			rc = submit_iso_write_urb(next);
			if (unlikely(rc <= 0 && rc != -ENODEV)) {
1111 1112 1113 1114 1115 1116 1117 1118 1119
				/* 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 */
1120 1121
					dev_err(cs->dev,
					      "losing isochronous write URB\n");
1122 1123 1124 1125 1126 1127 1128 1129
					error_hangup(bcs);
				}
			}
		}

		/* process completed URB */
		urb = done->urb;
		switch (urb->status) {
1130 1131 1132 1133
		case -EXDEV:			/* partial completion */
			gig_dbg(DEBUG_ISO, "%s: URB partially completed",
				__func__);
			/* fall through - what's the difference anyway? */
1134
		case 0:				/* normal completion */
1135 1136 1137
			/* inspect individual frames
			 * assumptions (for lack of documentation):
			 * - actual_length bytes of first frame in error are
1138
			 *   successfully sent
1139 1140
			 * - all following frames are not sent at all
			 */
1141
			offset = done->limit;	/* default (no error) */
1142 1143 1144 1145
			for (i = 0; i < BAS_NUMFRAMES; i++) {
				ifd = &urb->iso_frame_desc[i];
				if (ifd->status ||
				    ifd->actual_length != ifd->length) {
1146 1147 1148
					dev_warn(cs->dev,
					     "isochronous write: frame %d: %s, "
					     "only %d of %d bytes sent\n",
1149 1150 1151
					     i, get_usb_statmsg(ifd->status),
					     ifd->actual_length, ifd->length);
					offset = (ifd->offset +
1152 1153
						  ifd->actual_length)
						 % BAS_OUTBUFSIZE;
1154 1155 1156 1157 1158 1159 1160 1161 1162
					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) {
1163 1164 1165
					dev_warn(cs->dev,
					     "isochronous write: frame %d: %s, "
					     "%d of %d bytes sent\n",
1166 1167 1168
					     i, get_usb_statmsg(ifd->status),
					     ifd->actual_length, ifd->length);
					offset = (ifd->offset +
1169 1170
						  ifd->actual_length)
						 % BAS_OUTBUFSIZE;
1171 1172 1173 1174 1175
					break;
				}
			}
#endif
			break;
1176
		case -EPIPE:			/* stall - probably underrun */
1177
			dev_err(cs->dev, "isochronous write stalled\n");
1178 1179 1180
			error_hangup(bcs);
			break;
		default:			/* severe trouble */
1181 1182
			dev_warn(cs->dev, "isochronous write: %s\n",
				 get_usb_statmsg(urb->status));
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195
		}

		/* 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 */
1196 1197
			rc = submit_iso_write_urb(next);
			if (unlikely(rc <= 0 && rc != -ENODEV)) {
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
				/* 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);
1211 1212
			gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
				__func__, skb_queue_len(&bcs->squeue));
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
			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)
{
1232