drivers/isdn/gigaset/gigaset.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Siemens Gigaset 307x driver
   4  * Common header file for all connection variants
   5  *
   6  * Written by Stefan Eilers
   7  *        and Hansjoerg Lipp <hjlipp@web.de>
   8  *
   9  * =====================================================================
  10  * =====================================================================
  11  */
  12
  13 #ifndef GIGASET_H
  14 #define GIGASET_H
  15
  16 /* define global prefix for pr_ macros in linux/kernel.h */
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/compiler.h>
  22 #include <linux/types.h>
  23 #include <linux/ctype.h>
  24 #include <linux/slab.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/ppp_defs.h>
  29 #include <linux/timer.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/tty.h>
  32 #include <linux/tty_driver.h>
  33 #include <linux/list.h>
  34 #include <linux/atomic.h>
  35
  36 #define GIG_VERSION {0, 5, 0, 0}
  37 #define GIG_COMPAT  {0, 4, 0, 0}
  38
  39 #define MAX_REC_PARAMS 10       /* Max. number of params in response string */
  40 #define MAX_RESP_SIZE 511       /* Max. size of a response string */
  41
  42 #define MAX_EVENTS 64           /* size of event queue */
  43
  44 #define RBUFSIZE 8192
  45
  46 #define GIG_TICK 100            /* in milliseconds */
  47
  48 /* timeout values (unit: 1 sec) */
  49 #define INIT_TIMEOUT 1
  50
  51 /* timeout values (unit: 0.1 sec) */
  52 #define RING_TIMEOUT 3          /* for additional parameters to RING */
  53 #define BAS_TIMEOUT 20          /* for response to Base USB ops */
  54 #define ATRDY_TIMEOUT 3         /* for HD_READY_SEND_ATDATA */
  55
  56 #define BAS_RETRY 3             /* max. retries for base USB ops */
  57
  58 #define MAXACT 3
  59
  60 extern int gigaset_debuglevel;  /* "needs" cast to (enum debuglevel) */
  61
  62 /* debug flags, combine by adding/bitwise OR */
  63 enum debuglevel {
  64         DEBUG_INTR        = 0x00008, /* interrupt processing */
  65         DEBUG_CMD         = 0x00020, /* sent/received LL commands */
  66         DEBUG_STREAM      = 0x00040, /* application data stream I/O events */
  67         DEBUG_STREAM_DUMP = 0x00080, /* application data stream content */
  68         DEBUG_LLDATA      = 0x00100, /* sent/received LL data */
  69         DEBUG_EVENT       = 0x00200, /* event processing */
  70         DEBUG_HDLC        = 0x00800, /* M10x HDLC processing */
  71         DEBUG_CHANNEL     = 0x01000, /* channel allocation/deallocation */
  72         DEBUG_TRANSCMD    = 0x02000, /* AT-COMMANDS+RESPONSES */
  73         DEBUG_MCMD        = 0x04000, /* COMMANDS THAT ARE SENT VERY OFTEN */
  74         DEBUG_INIT        = 0x08000, /* (de)allocation+initialization of data
  75                                         structures */
  76         DEBUG_SUSPEND     = 0x10000, /* suspend/resume processing */
  77         DEBUG_OUTPUT      = 0x20000, /* output to device */
  78         DEBUG_ISO         = 0x40000, /* isochronous transfers */
  79         DEBUG_IF          = 0x80000, /* character device operations */
  80         DEBUG_USBREQ      = 0x100000, /* USB communication (except payload
  81                                          data) */
  82         DEBUG_LOCKCMD     = 0x200000, /* AT commands and responses when
  83                                          MS_LOCKED */
  84
  85         DEBUG_ANY         = 0x3fffff, /* print message if any of the others is
  86                                          activated */
  87 };
  88
  89 #ifdef CONFIG_GIGASET_DEBUG
  90
  91 #define gig_dbg(level, format, arg...)                                  \
  92         do {                                                            \
  93                 if (unlikely(((enum debuglevel)gigaset_debuglevel) & (level))) \
  94                         printk(KERN_DEBUG KBUILD_MODNAME ": " format "\n", \
  95                                ## arg);                                 \
  96         } while (0)
  97 #define DEBUG_DEFAULT (DEBUG_TRANSCMD | DEBUG_CMD | DEBUG_USBREQ)
  98
  99 #else
 100
 101 #define gig_dbg(level, format, arg...) do {} while (0)
 102 #define DEBUG_DEFAULT 0
 103
 104 #endif
 105
 106 void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
 107                         size_t len, const unsigned char *buf);
 108
 109 /* connection state */
 110 #define ZSAU_NONE                       0
 111 #define ZSAU_PROCEEDING                 1
 112 #define ZSAU_CALL_DELIVERED             2
 113 #define ZSAU_ACTIVE                     3
 114 #define ZSAU_DISCONNECT_IND             4
 115 #define ZSAU_NULL                       5
 116 #define ZSAU_DISCONNECT_REQ             6
 117 #define ZSAU_UNKNOWN                    -1
 118
 119 /* USB control transfer requests */
 120 #define OUT_VENDOR_REQ  (USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)
 121 #define IN_VENDOR_REQ   (USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT)
 122
 123 /* interrupt pipe messages */
 124 #define HD_B1_FLOW_CONTROL              0x80
 125 #define HD_B2_FLOW_CONTROL              0x81
 126 #define HD_RECEIVEATDATA_ACK            (0x35)          /* 3070 */
 127 #define HD_READY_SEND_ATDATA            (0x36)          /* 3070 */
 128 #define HD_OPEN_ATCHANNEL_ACK           (0x37)          /* 3070 */
 129 #define HD_CLOSE_ATCHANNEL_ACK          (0x38)          /* 3070 */
 130 #define HD_DEVICE_INIT_OK               (0x11)          /* ISurf USB + 3070 */
 131 #define HD_OPEN_B1CHANNEL_ACK           (0x51)          /* ISurf USB + 3070 */
 132 #define HD_OPEN_B2CHANNEL_ACK           (0x52)          /* ISurf USB + 3070 */
 133 #define HD_CLOSE_B1CHANNEL_ACK          (0x53)          /* ISurf USB + 3070 */
 134 #define HD_CLOSE_B2CHANNEL_ACK          (0x54)          /* ISurf USB + 3070 */
 135 #define HD_SUSPEND_END                  (0x61)          /* ISurf USB */
 136 #define HD_RESET_INTERRUPT_PIPE_ACK     (0xFF)          /* ISurf USB + 3070 */
 137
 138 /* control requests */
 139 #define HD_OPEN_B1CHANNEL               (0x23)          /* ISurf USB + 3070 */
 140 #define HD_CLOSE_B1CHANNEL              (0x24)          /* ISurf USB + 3070 */
 141 #define HD_OPEN_B2CHANNEL               (0x25)          /* ISurf USB + 3070 */
 142 #define HD_CLOSE_B2CHANNEL              (0x26)          /* ISurf USB + 3070 */
 143 #define HD_RESET_INTERRUPT_PIPE         (0x27)          /* ISurf USB + 3070 */
 144 #define HD_DEVICE_INIT_ACK              (0x34)          /* ISurf USB + 3070 */
 145 #define HD_WRITE_ATMESSAGE              (0x12)          /* 3070 */
 146 #define HD_READ_ATMESSAGE               (0x13)          /* 3070 */
 147 #define HD_OPEN_ATCHANNEL               (0x28)          /* 3070 */
 148 #define HD_CLOSE_ATCHANNEL              (0x29)          /* 3070 */
 149
 150 /* number of B channels supported by base driver */
 151 #define BAS_CHANNELS    2
 152
 153 /* USB frames for isochronous transfer */
 154 #define BAS_FRAMETIME   1       /* number of milliseconds between frames */
 155 #define BAS_NUMFRAMES   8       /* number of frames per URB */
 156 #define BAS_MAXFRAME    16      /* allocated bytes per frame */
 157 #define BAS_NORMFRAME   8       /* send size without flow control */
 158 #define BAS_HIGHFRAME   10      /* "    "    with positive flow control */
 159 #define BAS_LOWFRAME    5       /* "    "    with negative flow control */
 160 #define BAS_CORRFRAMES  4       /* flow control multiplicator */
 161
 162 #define BAS_INBUFSIZE   (BAS_MAXFRAME * BAS_NUMFRAMES)  /* size of isoc in buf
 163                                                          * per URB */
 164 #define BAS_OUTBUFSIZE  4096            /* size of common isoc out buffer */
 165 #define BAS_OUTBUFPAD   BAS_MAXFRAME    /* size of pad area for isoc out buf */
 166
 167 #define BAS_INURBS      3
 168 #define BAS_OUTURBS     3
 169
 170 /* variable commands in struct bc_state */
 171 #define AT_ISO          0
 172 #define AT_DIAL         1
 173 #define AT_MSN          2
 174 #define AT_BC           3
 175 #define AT_PROTO        4
 176 #define AT_TYPE         5
 177 #define AT_CLIP         6
 178 /* total number */
 179 #define AT_NUM          7
 180
 181 /* variables in struct at_state_t */
 182 /* - numeric */
 183 #define VAR_ZSAU        0
 184 #define VAR_ZDLE        1
 185 #define VAR_ZCTP        2
 186 /* total number */
 187 #define VAR_NUM         3
 188 /* - string */
 189 #define STR_NMBR        0
 190 #define STR_ZCPN        1
 191 #define STR_ZCON        2
 192 #define STR_ZBC         3
 193 #define STR_ZHLC        4
 194 /* total number */
 195 #define STR_NUM         5
 196
 197 /* event types */
 198 #define EV_TIMEOUT      -105
 199 #define EV_IF_VER       -106
 200 #define EV_PROC_CIDMODE -107
 201 #define EV_SHUTDOWN     -108
 202 #define EV_START        -110
 203 #define EV_STOP         -111
 204 #define EV_IF_LOCK      -112
 205 #define EV_ACCEPT       -114
 206 #define EV_DIAL         -115
 207 #define EV_HUP          -116
 208 #define EV_BC_OPEN      -117
 209 #define EV_BC_CLOSED    -118
 210
 211 /* input state */
 212 #define INS_command     0x0001  /* receiving messages (not payload data) */
 213 #define INS_DLE_char    0x0002  /* DLE flag received (in DLE mode) */
 214 #define INS_byte_stuff  0x0004
 215 #define INS_have_data   0x0008
 216 #define INS_DLE_command 0x0020  /* DLE message start (<DLE> X) received */
 217 #define INS_flag_hunt   0x0040
 218
 219 /* channel state */
 220 #define CHS_D_UP        0x01
 221 #define CHS_B_UP        0x02
 222 #define CHS_NOTIFY_LL   0x04
 223
 224 #define ICALL_REJECT    0
 225 #define ICALL_ACCEPT    1
 226 #define ICALL_IGNORE    2
 227
 228 /* device state */
 229 #define MS_UNINITIALIZED        0
 230 #define MS_INIT                 1
 231 #define MS_LOCKED               2
 232 #define MS_SHUTDOWN             3
 233 #define MS_RECOVER              4
 234 #define MS_READY                5
 235
 236 /* mode */
 237 #define M_UNKNOWN       0
 238 #define M_CONFIG        1
 239 #define M_UNIMODEM      2
 240 #define M_CID           3
 241
 242 /* start mode */
 243 #define SM_LOCKED       0
 244 #define SM_ISDN         1 /* default */
 245
 246 /* layer 2 protocols (AT^SBPR=...) */
 247 #define L2_BITSYNC      0
 248 #define L2_HDLC         1
 249 #define L2_VOICE        2
 250
 251 struct gigaset_ops;
 252 struct gigaset_driver;
 253
 254 struct usb_cardstate;
 255 struct ser_cardstate;
 256 struct bas_cardstate;
 257
 258 struct bc_state;
 259 struct usb_bc_state;
 260 struct ser_bc_state;
 261 struct bas_bc_state;
 262
 263 struct reply_t {
 264         int     resp_code;      /* RSP_XXXX */
 265         int     min_ConState;   /* <0 => ignore */
 266         int     max_ConState;   /* <0 => ignore */
 267         int     parameter;      /* e.g. ZSAU_XXXX <0: ignore*/
 268         int     new_ConState;   /* <0 => ignore */
 269         int     timeout;        /* >0 => *HZ; <=0 => TOUT_XXXX*/
 270         int     action[MAXACT]; /* ACT_XXXX */
 271         char    *command;       /* NULL==none */
 272 };
 273
 274 extern struct reply_t gigaset_tab_cid[];
 275 extern struct reply_t gigaset_tab_nocid[];
 276
 277 struct inbuf_t {
 278         struct cardstate        *cs;
 279         int                     inputstate;
 280         int                     head, tail;
 281         unsigned char           data[RBUFSIZE];
 282 };
 283
 284 /* isochronous write buffer structure
 285  * circular buffer with pad area for extraction of complete USB frames
 286  * - data[read..nextread-1] is valid data already submitted to the USB subsystem
 287  * - data[nextread..write-1] is valid data yet to be sent
 288  * - data[write] is the next byte to write to
 289  *   - in byte-oriented L2 procotols, it is completely free
 290  *   - in bit-oriented L2 procotols, it may contain a partial byte of valid data
 291  * - data[write+1..read-1] is free
 292  * - wbits is the number of valid data bits in data[write], starting at the LSB
 293  * - writesem is the semaphore for writing to the buffer:
 294  *   if writesem <= 0, data[write..read-1] is currently being written to
 295  * - idle contains the byte value to repeat when the end of valid data is
 296  *   reached; if nextread==write (buffer contains no data to send), either the
 297  *   BAS_OUTBUFPAD bytes immediately before data[write] (if
 298  *   write>=BAS_OUTBUFPAD) or those of the pad area (if write<BAS_OUTBUFPAD)
 299  *   are also filled with that value
 300  */
 301 struct isowbuf_t {
 302         int             read;
 303         int             nextread;
 304         int             write;
 305         atomic_t        writesem;
 306         int             wbits;
 307         unsigned char   data[BAS_OUTBUFSIZE + BAS_OUTBUFPAD];
 308         unsigned char   idle;
 309 };
 310
 311 /* isochronous write URB context structure
 312  * data to be stored along with the URB and retrieved when it is returned
 313  * as completed by the USB subsystem
 314  * - urb: pointer to the URB itself
 315  * - bcs: pointer to the B Channel control structure
 316  * - limit: end of write buffer area covered by this URB
 317  * - status: URB completion status
 318  */
 319 struct isow_urbctx_t {
 320         struct urb *urb;
 321         struct bc_state *bcs;
 322         int limit;
 323         int status;
 324 };
 325
 326 /* AT state structure
 327  * data associated with the state of an ISDN connection, whether or not
 328  * it is currently assigned a B channel
 329  */
 330 struct at_state_t {
 331         struct list_head        list;
 332         int                     waiting;
 333         int                     getstring;
 334         unsigned                timer_index;
 335         unsigned long           timer_expires;
 336         int                     timer_active;
 337         unsigned int            ConState;       /* State of connection */
 338         struct reply_t          *replystruct;
 339         int                     cid;
 340         int                     int_var[VAR_NUM];       /* see VAR_XXXX */
 341         char                    *str_var[STR_NUM];      /* see STR_XXXX */
 342         unsigned                pending_commands;       /* see PC_XXXX */
 343         unsigned                seq_index;
 344
 345         struct cardstate        *cs;
 346         struct bc_state         *bcs;
 347 };
 348
 349 struct event_t {
 350         int type;
 351         void *ptr, *arg;
 352         int parameter;
 353         int cid;
 354         struct at_state_t *at_state;
 355 };
 356
 357 /* This buffer holds all information about the used B-Channel */
 358 struct bc_state {
 359         struct sk_buff *tx_skb;         /* Current transfer buffer to modem */
 360         struct sk_buff_head squeue;     /* B-Channel send Queue */
 361
 362         /* Variables for debugging .. */
 363         int corrupted;                  /* Counter for corrupted packages */
 364         int trans_down;                 /* Counter of packages (downstream) */
 365         int trans_up;                   /* Counter of packages (upstream) */
 366
 367         struct at_state_t at_state;
 368
 369         /* receive buffer */
 370         unsigned rx_bufsize;            /* max size accepted by application */
 371         struct sk_buff *rx_skb;
 372         __u16 rx_fcs;
 373         int inputstate;                 /* see INS_XXXX */
 374
 375         int channel;
 376
 377         struct cardstate *cs;
 378
 379         unsigned chstate;               /* bitmap (CHS_*) */
 380         int ignore;
 381         unsigned proto2;                /* layer 2 protocol (L2_*) */
 382         char *commands[AT_NUM];         /* see AT_XXXX */
 383
 384 #ifdef CONFIG_GIGASET_DEBUG
 385         int emptycount;
 386 #endif
 387         int busy;
 388         int use_count;
 389
 390         /* private data of hardware drivers */
 391         union {
 392                 struct ser_bc_state *ser;       /* serial hardware driver */
 393                 struct usb_bc_state *usb;       /* usb hardware driver (m105) */
 394                 struct bas_bc_state *bas;       /* usb hardware driver (base) */
 395         } hw;
 396
 397         void *ap;                       /* associated LL application */
 398         int apconnstate;                /* LL application connection state */
 399         spinlock_t aplock;
 400 };
 401
 402 struct cardstate {
 403         struct gigaset_driver *driver;
 404         unsigned minor_index;
 405         struct device *dev;
 406         struct device *tty_dev;
 407         unsigned flags;
 408
 409         const struct gigaset_ops *ops;
 410
 411         /* Stuff to handle communication */
 412         wait_queue_head_t waitqueue;
 413         int waiting;
 414         int mode;                       /* see M_XXXX */
 415         int mstate;                     /* Modem state: see MS_XXXX */
 416                                         /* only changed by the event layer */
 417         int cmd_result;
 418
 419         int channels;
 420         struct bc_state *bcs;           /* Array of struct bc_state */
 421
 422         int onechannel;                 /* data and commands transmitted in one
 423                                            stream (M10x) */
 424
 425         spinlock_t lock;
 426         struct at_state_t at_state;     /* at_state_t for cid == 0 */
 427         struct list_head temp_at_states;/* list of temporary "struct
 428                                            at_state_t"s without B channel */
 429
 430         struct inbuf_t *inbuf;
 431
 432         struct cmdbuf_t *cmdbuf, *lastcmdbuf;
 433         spinlock_t cmdlock;
 434         unsigned curlen, cmdbytes;
 435
 436         struct tty_port port;
 437         struct tasklet_struct if_wake_tasklet;
 438         unsigned control_state;
 439
 440         unsigned fwver[4];
 441         int gotfwver;
 442
 443         unsigned running;               /* !=0 if events are handled */
 444         unsigned connected;             /* !=0 if hardware is connected */
 445         unsigned isdn_up;               /* !=0 after gigaset_isdn_start() */
 446
 447         unsigned cidmode;
 448
 449         int myid;                       /* id for communication with LL */
 450         void *iif;                      /* LL interface structure */
 451         unsigned short hw_hdr_len;      /* headroom needed in data skbs */
 452
 453         struct reply_t *tabnocid;
 454         struct reply_t *tabcid;
 455         int cs_init;
 456         int ignoreframes;               /* frames to ignore after setting up the
 457                                            B channel */
 458         struct mutex mutex;             /* locks this structure:
 459                                          *   connected is not changed,
 460                                          *   hardware_up is not changed,
 461                                          *   MState is not changed to or from
 462                                          *   MS_LOCKED */
 463
 464         struct timer_list timer;
 465         int retry_count;
 466         int dle;                        /* !=0 if DLE mode is active
 467                                            (ZDLE=1 received -- M10x only) */
 468         int cur_at_seq;                 /* sequence of AT commands being
 469                                            processed */
 470         int curchannel;                 /* channel those commands are meant
 471                                            for */
 472         int commands_pending;           /* flag(s) in xxx.commands_pending have
 473                                            been set */
 474         struct tasklet_struct
 475                 event_tasklet;          /* tasklet for serializing AT commands.
 476                                          * Scheduled
 477                                          *   -> for modem reponses (and
 478                                          *      incoming data for M10x)
 479                                          *   -> on timeout
 480                                          *   -> after setting bits in
 481                                          *      xxx.at_state.pending_command
 482                                          *      (e.g. command from LL) */
 483         struct tasklet_struct
 484                 write_tasklet;          /* tasklet for serial output
 485                                          * (not used in base driver) */
 486
 487         /* event queue */
 488         struct event_t events[MAX_EVENTS];
 489         unsigned ev_tail, ev_head;
 490         spinlock_t ev_lock;
 491
 492         /* current modem response */
 493         unsigned char respdata[MAX_RESP_SIZE + 1];
 494         unsigned cbytes;
 495
 496         /* private data of hardware drivers */
 497         union {
 498                 struct usb_cardstate *usb; /* USB hardware driver (m105) */
 499                 struct ser_cardstate *ser; /* serial hardware driver */
 500                 struct bas_cardstate *bas; /* USB hardware driver (base) */
 501         } hw;
 502 };
 503
 504 struct gigaset_driver {
 505         struct list_head list;
 506         spinlock_t lock;                /* locks minor tables and blocked */
 507         struct tty_driver *tty;
 508         unsigned have_tty;
 509         unsigned minor;
 510         unsigned minors;
 511         struct cardstate *cs;
 512         int blocked;
 513
 514         const struct gigaset_ops *ops;
 515         struct module *owner;
 516 };
 517
 518 struct cmdbuf_t {
 519         struct cmdbuf_t *next, *prev;
 520         int len, offset;
 521         struct tasklet_struct *wake_tasklet;
 522         unsigned char buf[0];
 523 };
 524
 525 struct bas_bc_state {
 526         /* isochronous output state */
 527         int             running;
 528         atomic_t        corrbytes;
 529         spinlock_t      isooutlock;
 530         struct isow_urbctx_t    isoouturbs[BAS_OUTURBS];
 531         struct isow_urbctx_t    *isooutdone, *isooutfree, *isooutovfl;
 532         struct isowbuf_t        *isooutbuf;
 533         unsigned numsub;                /* submitted URB counter
 534                                            (for diagnostic messages only) */
 535         struct tasklet_struct   sent_tasklet;
 536
 537         /* isochronous input state */
 538         spinlock_t isoinlock;
 539         struct urb *isoinurbs[BAS_INURBS];
 540         unsigned char isoinbuf[BAS_INBUFSIZE * BAS_INURBS];
 541         struct urb *isoindone;          /* completed isoc read URB */
 542         int isoinstatus;                /* status of completed URB */
 543         int loststatus;                 /* status of dropped URB */
 544         unsigned isoinlost;             /* number of bytes lost */
 545         /* state of bit unstuffing algorithm
 546            (in addition to BC_state.inputstate) */
 547         unsigned seqlen;                /* number of '1' bits not yet
 548                                            unstuffed */
 549         unsigned inbyte, inbits;        /* collected bits for next byte */
 550         /* statistics */
 551         unsigned goodbytes;             /* bytes correctly received */
 552         unsigned alignerrs;             /* frames with incomplete byte at end */
 553         unsigned fcserrs;               /* FCS errors */
 554         unsigned frameerrs;             /* framing errors */
 555         unsigned giants;                /* long frames */
 556         unsigned runts;                 /* short frames */
 557         unsigned aborts;                /* HDLC aborts */
 558         unsigned shared0s;              /* '0' bits shared between flags */
 559         unsigned stolen0s;              /* '0' stuff bits also serving as
 560                                            leading flag bits */
 561         struct tasklet_struct rcvd_tasklet;
 562 };
 563
 564 struct gigaset_ops {
 565         /* Called from ev-layer.c/interface.c for sending AT commands to the
 566            device */
 567         int (*write_cmd)(struct cardstate *cs, struct cmdbuf_t *cb);
 568
 569         /* Called from interface.c for additional device control */
 570         int (*write_room)(struct cardstate *cs);
 571         int (*chars_in_buffer)(struct cardstate *cs);
 572         int (*brkchars)(struct cardstate *cs, const unsigned char buf[6]);
 573
 574         /* Called from ev-layer.c after setting up connection
 575          * Should call gigaset_bchannel_up(), when finished. */
 576         int (*init_bchannel)(struct bc_state *bcs);
 577
 578         /* Called from ev-layer.c after hanging up
 579          * Should call gigaset_bchannel_down(), when finished. */
 580         int (*close_bchannel)(struct bc_state *bcs);
 581
 582         /* Called by gigaset_initcs() for setting up bcs->hw.xxx */
 583         int (*initbcshw)(struct bc_state *bcs);
 584
 585         /* Called by gigaset_freecs() for freeing bcs->hw.xxx */
 586         void (*freebcshw)(struct bc_state *bcs);
 587
 588         /* Called by gigaset_bchannel_down() for resetting bcs->hw.xxx */
 589         void (*reinitbcshw)(struct bc_state *bcs);
 590
 591         /* Called by gigaset_initcs() for setting up cs->hw.xxx */
 592         int (*initcshw)(struct cardstate *cs);
 593
 594         /* Called by gigaset_freecs() for freeing cs->hw.xxx */
 595         void (*freecshw)(struct cardstate *cs);
 596
 597         /* Called from common.c/interface.c for additional serial port
 598            control */
 599         int (*set_modem_ctrl)(struct cardstate *cs, unsigned old_state,
 600                               unsigned new_state);
 601         int (*baud_rate)(struct cardstate *cs, unsigned cflag);
 602         int (*set_line_ctrl)(struct cardstate *cs, unsigned cflag);
 603
 604         /* Called from LL interface to put an skb into the send-queue.
 605          * After sending is completed, gigaset_skb_sent() must be called
 606          * with the skb's link layer header preserved. */
 607         int (*send_skb)(struct bc_state *bcs, struct sk_buff *skb);
 608
 609         /* Called from ev-layer.c to process a block of data
 610          * received through the common/control channel. */
 611         void (*handle_input)(struct inbuf_t *inbuf);
 612
 613 };
 614
 615 /* = Common structures and definitions =======================================
 616  */
 617
 618 /* Parser states for DLE-Event:
 619  * <DLE-EVENT>: <DLE_FLAG> "X" <EVENT> <DLE_FLAG> "."
 620  * <DLE_FLAG>:  0x10
 621  * <EVENT>:     ((a-z)* | (A-Z)* | (0-10)*)+
 622  */
 623 #define DLE_FLAG        0x10
 624
 625 /* ===========================================================================
 626  *  Functions implemented in asyncdata.c
 627  */
 628
 629 /* Called from LL interface to put an skb into the send queue. */
 630 int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb);
 631
 632 /* Called from ev-layer.c to process a block of data
 633  * received through the common/control channel. */
 634 void gigaset_m10x_input(struct inbuf_t *inbuf);
 635
 636 /* ===========================================================================
 637  *  Functions implemented in isocdata.c
 638  */
 639
 640 /* Called from LL interface to put an skb into the send queue. */
 641 int gigaset_isoc_send_skb(struct bc_state *bcs, struct sk_buff *skb);
 642
 643 /* Called from ev-layer.c to process a block of data
 644  * received through the common/control channel. */
 645 void gigaset_isoc_input(struct inbuf_t *inbuf);
 646
 647 /* Called from bas-gigaset.c to process a block of data
 648  * received through the isochronous channel */
 649 void gigaset_isoc_receive(unsigned char *src, unsigned count,
 650                           struct bc_state *bcs);
 651
 652 /* Called from bas-gigaset.c to put a block of data
 653  * into the isochronous output buffer */
 654 int gigaset_isoc_buildframe(struct bc_state *bcs, unsigned char *in, int len);
 655
 656 /* Called from bas-gigaset.c to initialize the isochronous output buffer */
 657 void gigaset_isowbuf_init(struct isowbuf_t *iwb, unsigned char idle);
 658
 659 /* Called from bas-gigaset.c to retrieve a block of bytes for sending */
 660 int gigaset_isowbuf_getbytes(struct isowbuf_t *iwb, int size);
 661
 662 /* ===========================================================================
 663  *  Functions implemented in LL interface
 664  */
 665
 666 /* Called from common.c for setting up/shutting down with the ISDN subsystem */
 667 void gigaset_isdn_regdrv(void);
 668 void gigaset_isdn_unregdrv(void);
 669 int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid);
 670 void gigaset_isdn_unregdev(struct cardstate *cs);
 671
 672 /* Called from hardware module to indicate completion of an skb */
 673 void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb);
 674 void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb);
 675 void gigaset_isdn_rcv_err(struct bc_state *bcs);
 676
 677 /* Called from common.c/ev-layer.c to indicate events relevant to the LL */
 678 void gigaset_isdn_start(struct cardstate *cs);
 679 void gigaset_isdn_stop(struct cardstate *cs);
 680 int gigaset_isdn_icall(struct at_state_t *at_state);
 681 void gigaset_isdn_connD(struct bc_state *bcs);
 682 void gigaset_isdn_hupD(struct bc_state *bcs);
 683 void gigaset_isdn_connB(struct bc_state *bcs);
 684 void gigaset_isdn_hupB(struct bc_state *bcs);
 685
 686 /* ===========================================================================
 687  *  Functions implemented in ev-layer.c
 688  */
 689
 690 /* tasklet called from common.c to process queued events */
 691 void gigaset_handle_event(unsigned long data);
 692
 693 /* called from isocdata.c / asyncdata.c
 694  * when a complete modem response line has been received */
 695 void gigaset_handle_modem_response(struct cardstate *cs);
 696
 697 /* ===========================================================================
 698  *  Functions implemented in proc.c
 699  */
 700
 701 /* initialize sysfs for device */
 702 void gigaset_init_dev_sysfs(struct cardstate *cs);
 703 void gigaset_free_dev_sysfs(struct cardstate *cs);
 704
 705 /* ===========================================================================
 706  *  Functions implemented in common.c/gigaset.h
 707  */
 708
 709 void gigaset_bcs_reinit(struct bc_state *bcs);
 710 void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
 711                      struct cardstate *cs, int cid);
 712 int gigaset_get_channel(struct bc_state *bcs);
 713 struct bc_state *gigaset_get_free_channel(struct cardstate *cs);
 714 void gigaset_free_channel(struct bc_state *bcs);
 715 int gigaset_get_channels(struct cardstate *cs);
 716 void gigaset_free_channels(struct cardstate *cs);
 717 void gigaset_block_channels(struct cardstate *cs);
 718
 719 /* Allocate and initialize driver structure. */
 720 struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
 721                                           const char *procname,
 722                                           const char *devname,
 723                                           const struct gigaset_ops *ops,
 724                                           struct module *owner);
 725
 726 /* Deallocate driver structure. */
 727 void gigaset_freedriver(struct gigaset_driver *drv);
 728
 729 struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty);
 730 struct cardstate *gigaset_get_cs_by_id(int id);
 731 void gigaset_blockdriver(struct gigaset_driver *drv);
 732
 733 /* Allocate and initialize card state. Calls hardware dependent
 734    gigaset_init[b]cs(). */
 735 struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
 736                                  int onechannel, int ignoreframes,
 737                                  int cidmode, const char *modulename);
 738
 739 /* Free card state. Calls hardware dependent gigaset_free[b]cs(). */
 740 void gigaset_freecs(struct cardstate *cs);
 741
 742 /* Tell common.c that hardware and driver are ready. */
 743 int gigaset_start(struct cardstate *cs);
 744
 745 /* Tell common.c that the device is not present any more. */
 746 void gigaset_stop(struct cardstate *cs);
 747
 748 /* Tell common.c that the driver is being unloaded. */
 749 int gigaset_shutdown(struct cardstate *cs);
 750
 751 /* Append event to the queue.
 752  * Returns NULL on failure or a pointer to the event on success.
 753  * ptr must be kmalloc()ed (and not be freed by the caller).
 754  */
 755 struct event_t *gigaset_add_event(struct cardstate *cs,
 756                                   struct at_state_t *at_state, int type,
 757                                   void *ptr, int parameter, void *arg);
 758
 759 /* Called on CONFIG1 command from frontend. */
 760 int gigaset_enterconfigmode(struct cardstate *cs);
 761
 762 /* cs->lock must not be locked */
 763 static inline void gigaset_schedule_event(struct cardstate *cs)
 764 {
 765         unsigned long flags;
 766         spin_lock_irqsave(&cs->lock, flags);
 767         if (cs->running)
 768                 tasklet_schedule(&cs->event_tasklet);
 769         spin_unlock_irqrestore(&cs->lock, flags);
 770 }
 771
 772 /* Tell common.c that B channel has been closed. */
 773 /* cs->lock must not be locked */
 774 static inline void gigaset_bchannel_down(struct bc_state *bcs)
 775 {
 776         gigaset_add_event(bcs->cs, &bcs->at_state, EV_BC_CLOSED, NULL, 0, NULL);
 777         gigaset_schedule_event(bcs->cs);
 778 }
 779
 780 /* Tell common.c that B channel has been opened. */
 781 /* cs->lock must not be locked */
 782 static inline void gigaset_bchannel_up(struct bc_state *bcs)
 783 {
 784         gigaset_add_event(bcs->cs, &bcs->at_state, EV_BC_OPEN, NULL, 0, NULL);
 785         gigaset_schedule_event(bcs->cs);
 786 }
 787
 788 /* set up next receive skb for data mode */
 789 static inline struct sk_buff *gigaset_new_rx_skb(struct bc_state *bcs)
 790 {
 791         struct cardstate *cs = bcs->cs;
 792         unsigned short hw_hdr_len = cs->hw_hdr_len;
 793
 794         if (bcs->ignore) {
 795                 bcs->rx_skb = NULL;
 796         } else {
 797                 bcs->rx_skb = dev_alloc_skb(bcs->rx_bufsize + hw_hdr_len);
 798                 if (bcs->rx_skb == NULL)
 799                         dev_warn(cs->dev, "could not allocate skb\n");
 800                 else
 801                         skb_reserve(bcs->rx_skb, hw_hdr_len);
 802         }
 803         return bcs->rx_skb;
 804 }
 805
 806 /* append received bytes to inbuf */
 807 int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
 808                        unsigned numbytes);
 809
 810 /* ===========================================================================
 811  *  Functions implemented in interface.c
 812  */
 813
 814 /* initialize interface */
 815 void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
 816                            const char *devname);
 817 /* release interface */
 818 void gigaset_if_freedriver(struct gigaset_driver *drv);
 819 /* add minor */
 820 void gigaset_if_init(struct cardstate *cs);
 821 /* remove minor */
 822 void gigaset_if_free(struct cardstate *cs);
 823 /* device received data */
 824 void gigaset_if_receive(struct cardstate *cs,
 825                         unsigned char *buffer, size_t len);
 826
 827 #endif