aboutsummaryrefslogtreecommitdiff
path: root/drivers/isdn/gigaset/gigaset.h
blob: eb63a0f7a02a94191ef54c54740c778ece40a2cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
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
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
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
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
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
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
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
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
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
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
784
785
786
787
788
789
790
791
792
793
794
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
822
823
824
825
826
827
828
829
830
831
832
833
/*
 * Siemens Gigaset 307x driver
 * Common header file for all connection variants
 *
 * Written by Stefan Eilers
 *        and Hansjoerg Lipp <hjlipp@web.de>
 *
 * =====================================================================
 *	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.
 * =====================================================================
 */

#ifndef GIGASET_H
#define GIGASET_H

/* define global prefix for pr_ macros in linux/kernel.h */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/ppp_defs.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/list.h>
#include <linux/atomic.h>

#define GIG_VERSION {0, 5, 0, 0}
#define GIG_COMPAT  {0, 4, 0, 0}

#define MAX_REC_PARAMS 10	/* Max. number of params in response string */
#define MAX_RESP_SIZE 511	/* Max. size of a response string */

#define MAX_EVENTS 64		/* size of event queue */

#define RBUFSIZE 8192

#define GIG_TICK 100		/* in milliseconds */

/* timeout values (unit: 1 sec) */
#define INIT_TIMEOUT 1

/* timeout values (unit: 0.1 sec) */
#define RING_TIMEOUT 3		/* for additional parameters to RING */
#define BAS_TIMEOUT 20		/* for response to Base USB ops */
#define ATRDY_TIMEOUT 3		/* for HD_READY_SEND_ATDATA */

#define BAS_RETRY 3		/* max. retries for base USB ops */

#define MAXACT 3

extern int gigaset_debuglevel;	/* "needs" cast to (enum debuglevel) */

/* debug flags, combine by adding/bitwise OR */
enum debuglevel {
	DEBUG_INTR	  = 0x00008, /* interrupt processing */
	DEBUG_CMD	  = 0x00020, /* sent/received LL commands */
	DEBUG_STREAM	  = 0x00040, /* application data stream I/O events */
	DEBUG_STREAM_DUMP = 0x00080, /* application data stream content */
	DEBUG_LLDATA	  = 0x00100, /* sent/received LL data */
	DEBUG_EVENT	  = 0x00200, /* event processing */
	DEBUG_HDLC	  = 0x00800, /* M10x HDLC processing */
	DEBUG_CHANNEL	  = 0x01000, /* channel allocation/deallocation */
	DEBUG_TRANSCMD	  = 0x02000, /* AT-COMMANDS+RESPONSES */
	DEBUG_MCMD	  = 0x04000, /* COMMANDS THAT ARE SENT VERY OFTEN */
	DEBUG_INIT	  = 0x08000, /* (de)allocation+initialization of data
					structures */
	DEBUG_SUSPEND	  = 0x10000, /* suspend/resume processing */
	DEBUG_OUTPUT	  = 0x20000, /* output to device */
	DEBUG_ISO	  = 0x40000, /* isochronous transfers */
	DEBUG_IF	  = 0x80000, /* character device operations */
	DEBUG_USBREQ	  = 0x100000, /* USB communication (except payload
					 data) */
	DEBUG_LOCKCMD	  = 0x200000, /* AT commands and responses when
					 MS_LOCKED */

	DEBUG_ANY	  = 0x3fffff, /* print message if any of the others is
					 activated */
};

#ifdef CONFIG_GIGASET_DEBUG

#define gig_dbg(level, format, arg...)					\
	do {								\
		if (unlikely(((enum debuglevel)gigaset_debuglevel) & (level))) \
			printk(KERN_DEBUG KBUILD_MODNAME ": " format "\n", \
			       ## arg);					\
	} while (0)
#define DEBUG_DEFAULT (DEBUG_TRANSCMD | DEBUG_CMD | DEBUG_USBREQ)

#else

#define gig_dbg(level, format, arg...) do {} while (0)
#define DEBUG_DEFAULT 0

#endif

void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
			size_t len, const unsigned char *buf);

/* connection state */
#define ZSAU_NONE			0
#define ZSAU_PROCEEDING			1
#define ZSAU_CALL_DELIVERED		2
#define ZSAU_ACTIVE			3
#define ZSAU_DISCONNECT_IND		4
#define ZSAU_NULL			5
#define ZSAU_DISCONNECT_REQ		6
#define ZSAU_UNKNOWN			-1

/* USB control transfer requests */
#define OUT_VENDOR_REQ	(USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)
#define IN_VENDOR_REQ	(USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)

/* interrupt pipe messages */
#define HD_B1_FLOW_CONTROL		0x80
#define HD_B2_FLOW_CONTROL		0x81
#define HD_RECEIVEATDATA_ACK		(0x35)		/* 3070 */
#define HD_READY_SEND_ATDATA		(0x36)		/* 3070 */
#define HD_OPEN_ATCHANNEL_ACK		(0x37)		/* 3070 */
#define HD_CLOSE_ATCHANNEL_ACK		(0x38)		/* 3070 */
#define HD_DEVICE_INIT_OK		(0x11)		/* ISurf USB + 3070 */
#define HD_OPEN_B1CHANNEL_ACK		(0x51)		/* ISurf USB + 3070 */
#define HD_OPEN_B2CHANNEL_ACK		(0x52)		/* ISurf USB + 3070 */
#define HD_CLOSE_B1CHANNEL_ACK		(0x53)		/* ISurf USB + 3070 */
#define HD_CLOSE_B2CHANNEL_ACK		(0x54)		/* ISurf USB + 3070 */
#define HD_SUSPEND_END			(0x61)		/* ISurf USB */
#define HD_RESET_INTERRUPT_PIPE_ACK	(0xFF)		/* ISurf USB + 3070 */

/* control requests */
#define	HD_OPEN_B1CHANNEL		(0x23)		/* ISurf USB + 3070 */
#define	HD_CLOSE_B1CHANNEL		(0x24)		/* ISurf USB + 3070 */
#define	HD_OPEN_B2CHANNEL		(0x25)		/* ISurf USB + 3070 */
#define	HD_CLOSE_B2CHANNEL		(0x26)		/* ISurf USB + 3070 */
#define HD_RESET_INTERRUPT_PIPE		(0x27)		/* ISurf USB + 3070 */
#define	HD_DEVICE_INIT_ACK		(0x34)		/* ISurf USB + 3070 */
#define	HD_WRITE_ATMESSAGE		(0x12)		/* 3070 */
#define	HD_READ_ATMESSAGE		(0x13)		/* 3070 */
#define	HD_OPEN_ATCHANNEL		(0x28)		/* 3070 */
#define	HD_CLOSE_ATCHANNEL		(0x29)		/* 3070 */

/* number of B channels supported by base driver */
#define BAS_CHANNELS	2

/* USB frames for isochronous transfer */
#define BAS_FRAMETIME	1	/* number of milliseconds between frames */
#define BAS_NUMFRAMES	8	/* number of frames per URB */
#define BAS_MAXFRAME	16	/* allocated bytes per frame */
#define BAS_NORMFRAME	8	/* send size without flow control */
#define BAS_HIGHFRAME	10	/* "    "    with positive flow control */
#define BAS_LOWFRAME	5	/* "    "    with negative flow control */
#define BAS_CORRFRAMES	4	/* flow control multiplicator */

#define BAS_INBUFSIZE	(BAS_MAXFRAME * BAS_NUMFRAMES)	/* size of isoc in buf
							 * per URB */
#define BAS_OUTBUFSIZE	4096		/* size of common isoc out buffer */
#define BAS_OUTBUFPAD	BAS_MAXFRAME	/* size of pad area for isoc out buf */

#define BAS_INURBS	3
#define BAS_OUTURBS	3

/* variable commands in struct bc_state */
#define AT_ISO		0
#define AT_DIAL		1
#define AT_MSN		2
#define AT_BC		3
#define AT_PROTO	4
#define AT_TYPE		5
#define AT_CLIP		6
/* total number */
#define AT_NUM		7

/* variables in struct at_state_t */
/* - numeric */
#define VAR_ZSAU	0
#define VAR_ZDLE	1
#define VAR_ZCTP	2
/* total number */
#define VAR_NUM		3
/* - string */
#define STR_NMBR	0
#define STR_ZCPN	1
#define STR_ZCON	2
#define STR_ZBC		3
#define STR_ZHLC	4
/* total number */
#define STR_NUM		5

/* event types */
#define EV_TIMEOUT	-105
#define EV_IF_VER	-106
#define EV_PROC_CIDMODE	-107
#define EV_SHUTDOWN	-108
#define EV_START	-110
#define EV_STOP		-111
#define EV_IF_LOCK	-112
#define EV_ACCEPT	-114
#define EV_DIAL		-115
#define EV_HUP		-116
#define EV_BC_OPEN	-117
#define EV_BC_CLOSED	-118

/* input state */
#define INS_command	0x0001	/* receiving messages (not payload data) */
#define INS_DLE_char	0x0002	/* DLE flag received (in DLE mode) */
#define INS_byte_stuff	0x0004
#define INS_have_data	0x0008
#define INS_DLE_command	0x0020	/* DLE message start (<DLE> X) received */
#define INS_flag_hunt	0x0040

/* channel state */
#define CHS_D_UP	0x01
#define CHS_B_UP	0x02
#define CHS_NOTIFY_LL	0x04

#define ICALL_REJECT	0
#define ICALL_ACCEPT	1
#define ICALL_IGNORE	2

/* device state */
#define MS_UNINITIALIZED	0
#define MS_INIT			1
#define MS_LOCKED		2
#define MS_SHUTDOWN		3
#define MS_RECOVER		4
#define MS_READY		5

/* mode */
#define M_UNKNOWN	0
#define M_CONFIG	1
#define M_UNIMODEM	2
#define M_CID		3

/* start mode */
#define SM_LOCKED	0
#define SM_ISDN		1 /* default */

/* layer 2 protocols (AT^SBPR=...) */
#define L2_BITSYNC	0
#define L2_HDLC		1
#define L2_VOICE	2

struct gigaset_ops;
struct gigaset_driver;

struct usb_cardstate;
struct ser_cardstate;
struct bas_cardstate;

struct bc_state;
struct usb_bc_state;
struct ser_bc_state;
struct bas_bc_state;

struct reply_t {
	int	resp_code;	/* RSP_XXXX */
	int	min_ConState;	/* <0 => ignore */
	int	max_ConState;	/* <0 => ignore */
	int	parameter;	/* e.g. ZSAU_XXXX <0: ignore*/
	int	new_ConState;	/* <0 => ignore */
	int	timeout;	/* >0 => *HZ; <=0 => TOUT_XXXX*/
	int	action[MAXACT];	/* ACT_XXXX */
	char	*command;	/* NULL==none */
};

extern struct reply_t gigaset_tab_cid[];
extern struct reply_t gigaset_tab_nocid[];

struct inbuf_t {
	struct cardstate	*cs;
	int			inputstate;
	int			head, tail;
	unsigned char		data[RBUFSIZE];
};

/* isochronous write buffer structure
 * circular buffer with pad area for extraction of complete USB frames
 * - data[read..nextread-1] is valid data already submitted to the USB subsystem
 * - data[nextread..write-1] is valid data yet to be sent
 * - data[write] is the next byte to write to
 *   - in byte-oriented L2 procotols, it is completely free
 *   - in bit-oriented L2 procotols, it may contain a partial byte of valid data
 * - data[write+1..read-1] is free
 * - wbits is the number of valid data bits in data[write], starting at the LSB
 * - writesem is the semaphore for writing to the buffer:
 *   if writesem <= 0, data[write..read-1] is currently being written to
 * - idle contains the byte value to repeat when the end of valid data is
 *   reached; if nextread==write (buffer contains no data to send), either the
 *   BAS_OUTBUFPAD bytes immediately before data[write] (if
 *   write>=BAS_OUTBUFPAD) or those of the pad area (if write<BAS_OUTBUFPAD)
 *   are also filled with that value
 */
struct isowbuf_t {
	int		read;
	int		nextread;
	int		write;
	atomic_t	writesem;
	int		wbits;
	unsigned char	data[BAS_OUTBUFSIZE + BAS_OUTBUFPAD];
	unsigned char	idle;
};

/* isochronous write URB context structure
 * data to be stored along with the URB and retrieved when it is returned
 * as completed by the USB subsystem
 * - urb: pointer to the URB itself
 * - bcs: pointer to the B Channel control structure
 * - limit: end of write buffer area covered by this URB
 * - status: URB completion status
 */
struct isow_urbctx_t {
	struct urb *urb;
	struct bc_state *bcs;
	int limit;
	int status;
};

/* AT state structure
 * data associated with the state of an ISDN connection, whether or not
 * it is currently assigned a B channel
 */
struct at_state_t {
	struct list_head	list;
	int			waiting;
	int			getstring;
	unsigned		timer_index;
	unsigned long		timer_expires;
	int			timer_active;
	unsigned int		ConState;	/* State of connection */
	struct reply_t		*replystruct;
	int			cid;
	int			int_var[VAR_NUM];	/* see VAR_XXXX */
	char			*str_var[STR_NUM];	/* see STR_XXXX */
	unsigned		pending_commands;	/* see PC_XXXX */
	unsigned		seq_index;

	struct cardstate	*cs;
	struct bc_state		*bcs;
};

struct event_t {
	int type;
	void *ptr, *arg;
	int parameter;
	int cid;
	struct at_state_t *at_state;
};

/* This buffer holds all information about the used B-Channel */
struct bc_state {
	struct sk_buff *tx_skb;		/* Current transfer buffer to modem */
	struct sk_buff_head squeue;	/* B-Channel send Queue */

	/* Variables for debugging .. */
	int corrupted;			/* Counter for corrupted packages */
	int trans_down;			/* Counter of packages (downstream) */
	int trans_up;			/* Counter of packages (upstream) */

	struct at_state_t at_state;

	/* receive buffer */
	unsigned rx_bufsize;		/* max size accepted by application */
	struct sk_buff *rx_skb;
	__u16 rx_fcs;
	int inputstate;			/* see INS_XXXX */

	int channel;

	struct cardstate *cs;

	unsigned chstate;		/* bitmap (CHS_*) */
	int ignore;
	unsigned proto2;		/* layer 2 protocol (L2_*) */
	char *commands[AT_NUM];		/* see AT_XXXX */

#ifdef CONFIG_GIGASET_DEBUG
	int emptycount;
#endif
	int busy;
	int use_count;

	/* private data of hardware drivers */
	union {
		struct ser_bc_state *ser;	/* serial hardware driver */
		struct usb_bc_state *usb;	/* usb hardware driver (m105) */
		struct bas_bc_state *bas;	/* usb hardware driver (base) */
	} hw;

	void *ap;			/* associated LL application */
	int apconnstate;		/* LL application connection state */
	spinlock_t aplock;
};

struct cardstate {
	struct gigaset_driver *driver;
	unsigned minor_index;
	struct device *dev;
	struct device *tty_dev;
	unsigned flags;

	const struct gigaset_ops *ops;

	/* Stuff to handle communication */
	wait_queue_head_t waitqueue;
	int waiting;
	int mode;			/* see M_XXXX */
	int mstate;			/* Modem state: see MS_XXXX */
					/* only changed by the event layer */
	int cmd_result;

	int channels;
	struct bc_state *bcs;		/* Array of struct bc_state */

	int onechannel;			/* data and commands transmitted in one
					   stream (M10x) */

	spinlock_t lock;
	struct at_state_t at_state;	/* at_state_t for cid == 0 */
	struct list_head temp_at_states;/* list of temporary "struct
					   at_state_t"s without B channel */

	struct inbuf_t *inbuf;

	struct cmdbuf_t *cmdbuf, *lastcmdbuf;
	spinlock_t cmdlock;
	unsigned curlen, cmdbytes;

	struct tty_port port;
	struct tasklet_struct if_wake_tasklet;
	unsigned control_state;

	unsigned fwver[4];
	int gotfwver;

	unsigned running;		/* !=0 if events are handled */
	unsigned connected;		/* !=0 if hardware is connected */
	unsigned isdn_up;		/* !=0 after gigaset_isdn_start() */

	unsigned cidmode;

	int myid;			/* id for communication with LL */
	void *iif;			/* LL interface structure */
	unsigned short hw_hdr_len;	/* headroom needed in data skbs */

	struct reply_t *tabnocid;
	struct reply_t *tabcid;
	int cs_init;
	int ignoreframes;		/* frames to ignore after setting up the
					   B channel */
	struct mutex mutex;		/* locks this structure:
					 *   connected is not changed,
					 *   hardware_up is not changed,
					 *   MState is not changed to or from
					 *   MS_LOCKED */

	struct timer_list timer;
	int retry_count;
	int dle;			/* !=0 if DLE mode is active
					   (ZDLE=1 received -- M10x only) */
	int cur_at_seq;			/* sequence of AT commands being
					   processed */
	int curchannel;			/* channel those commands are meant
					   for */
	int commands_pending;		/* flag(s) in xxx.commands_pending have
					   been set */
	struct tasklet_struct
		event_tasklet;		/* tasklet for serializing AT commands.
					 * Scheduled
					 *   -> for modem reponses (and
					 *      incoming data for M10x)
					 *   -> on timeout
					 *   -> after setting bits in
					 *      xxx.at_state.pending_command
					 *      (e.g. command from LL) */
	struct tasklet_struct
		write_tasklet;		/* tasklet for serial output
					 * (not used in base driver) */

	/* event queue */
	struct event_t events[MAX_EVENTS];
	unsigned ev_tail, ev_head;
	spinlock_t ev_lock;

	/* current modem response */
	unsigned char respdata[MAX_RESP_SIZE + 1];
	unsigned cbytes;

	/* private data of hardware drivers */
	union {
		struct usb_cardstate *usb; /* USB hardware driver (m105) */
		struct ser_cardstate *ser; /* serial hardware driver */
		struct bas_cardstate *bas; /* USB hardware driver (base) */
	} hw;
};

struct gigaset_driver {
	struct list_head list;
	spinlock_t lock;		/* locks minor tables and blocked */
	struct tty_driver *tty;
	unsigned have_tty;
	unsigned minor;
	unsigned minors;
	struct cardstate *cs;
	int blocked;

	const struct gigaset_ops *ops;
	struct module *owner;
};

struct cmdbuf_t {
	struct cmdbuf_t *next, *prev;
	int len, offset;
	struct tasklet_struct *wake_tasklet;
	unsigned char buf[0];
};

struct bas_bc_state {
	/* isochronous output state */
	int		running;
	atomic_t	corrbytes;
	spinlock_t	isooutlock;
	struct isow_urbctx_t	isoouturbs[BAS_OUTURBS];
	struct isow_urbctx_t	*isooutdone, *isooutfree, *isooutovfl;
	struct isowbuf_t	*isooutbuf;
	unsigned numsub;		/* submitted URB counter
					   (for diagnostic messages only) */
	struct tasklet_struct	sent_tasklet;

	/* isochronous input state */
	spinlock_t isoinlock;
	struct urb *isoinurbs[BAS_INURBS];
	unsigned char isoinbuf[BAS_INBUFSIZE * BAS_INURBS];
	struct urb *isoindone;		/* completed isoc read URB */
	int isoinstatus;		/* status of completed URB */
	int loststatus;			/* status of dropped URB */
	unsigned isoinlost;		/* number of bytes lost */
	/* state of bit unstuffing algorithm
	   (in addition to BC_state.inputstate) */
	unsigned seqlen;		/* number of '1' bits not yet
					   unstuffed */
	unsigned inbyte, inbits;	/* collected bits for next byte */
	/* statistics */
	unsigned goodbytes;		/* bytes correctly received */
	unsigned alignerrs;		/* frames with incomplete byte at end */
	unsigned fcserrs;		/* FCS errors */
	unsigned frameerrs;		/* framing errors */
	unsigned giants;		/* long frames */
	unsigned runts;			/* short frames */
	unsigned aborts;		/* HDLC aborts */
	unsigned shared0s;		/* '0' bits shared between flags */
	unsigned stolen0s;		/* '0' stuff bits also serving as
					   leading flag bits */
	struct tasklet_struct rcvd_tasklet;
};

struct gigaset_ops {
	/* Called from ev-layer.c/interface.c for sending AT commands to the
	   device */
	int (*write_cmd)(struct cardstate *cs, struct cmdbuf_t *cb);

	/* Called from interface.c for additional device control */
	int (*write_room)(struct cardstate *cs);
	int (*chars_in_buffer)(struct cardstate *cs);
	int (*brkchars)(struct cardstate *cs, const unsigned char buf[6]);

	/* Called from ev-layer.c after setting up connection
	 * Should call gigaset_bchannel_up(), when finished. */
	int (*init_bchannel)(struct bc_state *bcs);

	/* Called from ev-layer.c after hanging up
	 * Should call gigaset_bchannel_down(), when finished. */
	int (*close_bchannel)(struct bc_state *bcs);

	/* Called by gigaset_initcs() for setting up bcs->hw.xxx */
	int (*initbcshw)(struct bc_state *bcs);

	/* Called by gigaset_freecs() for freeing bcs->hw.xxx */
	void (*freebcshw)(struct bc_state *bcs);

	/* Called by gigaset_bchannel_down() for resetting bcs->hw.xxx */
	void (*reinitbcshw)(struct bc_state *bcs);

	/* Called by gigaset_initcs() for setting up cs->hw.xxx */
	int (*initcshw)(struct cardstate *cs);

	/* Called by gigaset_freecs() for freeing cs->hw.xxx */
	void (*freecshw)(struct cardstate *cs);

	/* Called from common.c/interface.c for additional serial port
	   control */
	int (*set_modem_ctrl)(struct cardstate *cs, unsigned old_state,
			      unsigned new_state);
	int (*baud_rate)(struct cardstate *cs, unsigned cflag);
	int (*set_line_ctrl)(struct cardstate *cs, unsigned cflag);

	/* Called from LL interface to put an skb into the send-queue.
	 * After sending is completed, gigaset_skb_sent() must be called
	 * with the skb's link layer header preserved. */
	int (*send_skb)(struct bc_state *bcs, struct sk_buff *skb);

	/* Called from ev-layer.c to process a block of data
	 * received through the common/control channel. */
	void (*handle_input)(struct inbuf_t *inbuf);

};

/* = Common structures and definitions =======================================
 */

/* Parser states for DLE-Event:
 * <DLE-EVENT>: <DLE_FLAG> "X" <EVENT> <DLE_FLAG> "."
 * <DLE_FLAG>:  0x10
 * <EVENT>:     ((a-z)* | (A-Z)* | (0-10)*)+
 */
#define DLE_FLAG	0x10

/* ===========================================================================
 *  Functions implemented in asyncdata.c
 */

/* Called from LL interface to put an skb into the send queue. */
int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb);

/* Called from ev-layer.c to process a block of data
 * received through the common/control channel. */
void gigaset_m10x_input(struct inbuf_t *inbuf);

/* ===========================================================================
 *  Functions implemented in isocdata.c
 */

/* Called from LL interface to put an skb into the send queue. */
int gigaset_isoc_send_skb(struct bc_state *bcs, struct sk_buff *skb);

/* Called from ev-layer.c to process a block of data
 * received through the common/control channel. */
void gigaset_isoc_input(struct inbuf_t *inbuf);

/* Called from bas-gigaset.c to process a block of data
 * received through the isochronous channel */
void gigaset_isoc_receive(unsigned char *src, unsigned count,
			  struct bc_state *bcs);

/* Called from bas-gigaset.c to put a block of data
 * into the isochronous output buffer */
int gigaset_isoc_buildframe(struct bc_state *bcs, unsigned char *in, int len);

/* Called from bas-gigaset.c to initialize the isochronous output buffer */
void gigaset_isowbuf_init(struct isowbuf_t *iwb, unsigned char idle);

/* Called from bas-gigaset.c to retrieve a block of bytes for sending */
int gigaset_isowbuf_getbytes(struct isowbuf_t *iwb, int size);

/* ===========================================================================
 *  Functions implemented in LL interface
 */

/* Called from common.c for setting up/shutting down with the ISDN subsystem */
void gigaset_isdn_regdrv(void);
void gigaset_isdn_unregdrv(void);
int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid);
void gigaset_isdn_unregdev(struct cardstate *cs);

/* Called from hardware module to indicate completion of an skb */
void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb);
void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb);
void gigaset_isdn_rcv_err(struct bc_state *bcs);

/* Called from common.c/ev-layer.c to indicate events relevant to the LL */
void gigaset_isdn_start(struct cardstate *cs);
void gigaset_isdn_stop(struct cardstate *cs);
int gigaset_isdn_icall(struct at_state_t *at_state);
void gigaset_isdn_connD(struct bc_state *bcs);
void gigaset_isdn_hupD(struct bc_state *bcs);
void gigaset_isdn_connB(struct bc_state *bcs);
void gigaset_isdn_hupB(struct bc_state *bcs);

/* ===========================================================================
 *  Functions implemented in ev-layer.c
 */

/* tasklet called from common.c to process queued events */
void gigaset_handle_event(unsigned long data);

/* called from isocdata.c / asyncdata.c
 * when a complete modem response line has been received */
void gigaset_handle_modem_response(struct cardstate *cs);

/* ===========================================================================
 *  Functions implemented in proc.c
 */

/* initialize sysfs for device */
void gigaset_init_dev_sysfs(struct cardstate *cs);
void gigaset_free_dev_sysfs(struct cardstate *cs);

/* ===========================================================================
 *  Functions implemented in common.c/gigaset.h
 */

void gigaset_bcs_reinit(struct bc_state *bcs);
void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
		     struct cardstate *cs, int cid);
int gigaset_get_channel(struct bc_state *bcs);
struct bc_state *gigaset_get_free_channel(struct cardstate *cs);
void gigaset_free_channel(struct bc_state *bcs);
int gigaset_get_channels(struct cardstate *cs);
void gigaset_free_channels(struct cardstate *cs);
void gigaset_block_channels(struct cardstate *cs);

/* Allocate and initialize driver structure. */
struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
					  const char *procname,
					  const char *devname,
					  const struct gigaset_ops *ops,
					  struct module *owner);

/* Deallocate driver structure. */
void gigaset_freedriver(struct gigaset_driver *drv);

struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty);
struct cardstate *gigaset_get_cs_by_id(int id);
void gigaset_blockdriver(struct gigaset_driver *drv);

/* Allocate and initialize card state. Calls hardware dependent
   gigaset_init[b]cs(). */
struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
				 int onechannel, int ignoreframes,
				 int cidmode, const char *modulename);

/* Free card state. Calls hardware dependent gigaset_free[b]cs(). */
void gigaset_freecs(struct cardstate *cs);

/* Tell common.c that hardware and driver are ready. */
int gigaset_start(struct cardstate *cs);

/* Tell common.c that the device is not present any more. */
void gigaset_stop(struct cardstate *cs);

/* Tell common.c that the driver is being unloaded. */
int gigaset_shutdown(struct cardstate *cs);

/* Tell common.c that an skb has been sent. */
void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb);

/* Append event to the queue.
 * Returns NULL on failure or a pointer to the event on success.
 * ptr must be kmalloc()ed (and not be freed by the caller).
 */
struct event_t *gigaset_add_event(struct cardstate *cs,
				  struct at_state_t *at_state, int type,
				  void *ptr, int parameter, void *arg);

/* Called on CONFIG1 command from frontend. */
int gigaset_enterconfigmode(struct cardstate *cs);

/* cs->lock must not be locked */
static inline void gigaset_schedule_event(struct cardstate *cs)
{
	unsigned long flags;
	spin_lock_irqsave(&cs->lock, flags);
	if (cs->running)
		tasklet_schedule(&cs->event_tasklet);
	spin_unlock_irqrestore(&cs->lock, flags);
}

/* Tell common.c that B channel has been closed. */
/* cs->lock must not be locked */
static inline void gigaset_bchannel_down(struct bc_state *bcs)
{
	gigaset_add_event(bcs->cs, &bcs->at_state, EV_BC_CLOSED, NULL, 0, NULL);
	gigaset_schedule_event(bcs->cs);
}

/* Tell common.c that B channel has been opened. */
/* cs->lock must not be locked */
static inline void gigaset_bchannel_up(struct bc_state *bcs)
{
	gigaset_add_event(bcs->cs, &bcs->at_state, EV_BC_OPEN, NULL, 0, NULL);
	gigaset_schedule_event(bcs->cs);
}

/* set up next receive skb for data mode */
static inline struct sk_buff *gigaset_new_rx_skb(struct bc_state *bcs)
{
	struct cardstate *cs = bcs->cs;
	unsigned short hw_hdr_len = cs->hw_hdr_len;

	if (bcs->ignore) {
		bcs->rx_skb = NULL;
	} else {
		bcs->rx_skb = dev_alloc_skb(bcs->rx_bufsize + hw_hdr_len);
		if (bcs->rx_skb == NULL)
			dev_warn(cs->dev, "could not allocate skb\n");
		else
			skb_reserve(bcs->rx_skb, hw_hdr_len);
	}
	return bcs->rx_skb;
}

/* append received bytes to inbuf */
int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
		       unsigned numbytes);

/* ===========================================================================
 *  Functions implemented in interface.c
 */

/* initialize interface */
void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
			   const char *devname);
/* release interface */
void gigaset_if_freedriver(struct gigaset_driver *drv);
/* add minor */
void gigaset_if_init(struct cardstate *cs);
/* remove minor */
void gigaset_if_free(struct cardstate *cs);
/* device received data */
void gigaset_if_receive(struct cardstate *cs,
			unsigned char *buffer, size_t len);

#endif