include/linux/atmdev.h

   1 /* atmdev.h - ATM device driver declarations and various related items */
   2
   3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4
   5
   6 #ifndef LINUX_ATMDEV_H
   7 #define LINUX_ATMDEV_H
   8
   9
  10 #include <linux/atmapi.h>
  11 #include <linux/atm.h>
  12 #include <linux/atmioc.h>
  13
  14
  15 #define ESI_LEN         6
  16
  17 #define ATM_OC3_PCR     (155520000/270*260/8/53)
  18                         /* OC3 link rate:  155520000 bps
  19                            SONET overhead: /270*260 (9 section, 1 path)
  20                            bits per cell:  /8/53
  21                            max cell rate:  353207.547 cells/sec */
  22 #define ATM_25_PCR      ((25600000/8-8000)/54)
  23                         /* 25 Mbps ATM cell rate (59111) */
  24 #define ATM_OC12_PCR    (622080000/1080*1040/8/53)
  25                         /* OC12 link rate: 622080000 bps
  26                            SONET overhead: /1080*1040
  27                            bits per cell:  /8/53
  28                            max cell rate:  1412830.188 cells/sec */
  29 #define ATM_DS3_PCR     (8000*12)
  30                         /* DS3: 12 cells in a 125 usec time slot */
  31
  32
  33 #define __AAL_STAT_ITEMS \
  34     __HANDLE_ITEM(tx);                  /* TX okay */ \
  35     __HANDLE_ITEM(tx_err);              /* TX errors */ \
  36     __HANDLE_ITEM(rx);                  /* RX okay */ \
  37     __HANDLE_ITEM(rx_err);              /* RX errors */ \
  38     __HANDLE_ITEM(rx_drop);             /* RX out of memory */
  39
  40 struct atm_aal_stats {
  41 #define __HANDLE_ITEM(i) int i
  42         __AAL_STAT_ITEMS
  43 #undef __HANDLE_ITEM
  44 };
  45
  46
  47 struct atm_dev_stats {
  48         struct atm_aal_stats aal0;
  49         struct atm_aal_stats aal34;
  50         struct atm_aal_stats aal5;
  51 } __ATM_API_ALIGN;
  52
  53
  54 #define ATM_GETLINKRATE _IOW('a',ATMIOC_ITF+1,struct atmif_sioc)
  55                                         /* get link rate */
  56 #define ATM_GETNAMES    _IOW('a',ATMIOC_ITF+3,struct atm_iobuf)
  57                                         /* get interface names (numbers) */
  58 #define ATM_GETTYPE     _IOW('a',ATMIOC_ITF+4,struct atmif_sioc)
  59                                         /* get interface type name */
  60 #define ATM_GETESI      _IOW('a',ATMIOC_ITF+5,struct atmif_sioc)
  61                                         /* get interface ESI */
  62 #define ATM_GETADDR     _IOW('a',ATMIOC_ITF+6,struct atmif_sioc)
  63                                         /* get itf's local ATM addr. list */
  64 #define ATM_RSTADDR     _IOW('a',ATMIOC_ITF+7,struct atmif_sioc)
  65                                         /* reset itf's ATM address list */
  66 #define ATM_ADDADDR     _IOW('a',ATMIOC_ITF+8,struct atmif_sioc)
  67                                         /* add a local ATM address */
  68 #define ATM_DELADDR     _IOW('a',ATMIOC_ITF+9,struct atmif_sioc)
  69                                         /* remove a local ATM address */
  70 #define ATM_GETCIRANGE  _IOW('a',ATMIOC_ITF+10,struct atmif_sioc)
  71                                         /* get connection identifier range */
  72 #define ATM_SETCIRANGE  _IOW('a',ATMIOC_ITF+11,struct atmif_sioc)
  73                                         /* set connection identifier range */
  74 #define ATM_SETESI      _IOW('a',ATMIOC_ITF+12,struct atmif_sioc)
  75                                         /* set interface ESI */
  76 #define ATM_SETESIF     _IOW('a',ATMIOC_ITF+13,struct atmif_sioc)
  77                                         /* force interface ESI */
  78 #define ATM_ADDLECSADDR _IOW('a', ATMIOC_ITF+14, struct atmif_sioc)
  79                                         /* register a LECS address */
  80 #define ATM_DELLECSADDR _IOW('a', ATMIOC_ITF+15, struct atmif_sioc)
  81                                         /* unregister a LECS address */
  82 #define ATM_GETLECSADDR _IOW('a', ATMIOC_ITF+16, struct atmif_sioc)
  83                                         /* retrieve LECS address(es) */
  84
  85 #define ATM_GETSTAT     _IOW('a',ATMIOC_SARCOM+0,struct atmif_sioc)
  86                                         /* get AAL layer statistics */
  87 #define ATM_GETSTATZ    _IOW('a',ATMIOC_SARCOM+1,struct atmif_sioc)
  88                                         /* get AAL layer statistics and zero */
  89 #define ATM_GETLOOP     _IOW('a',ATMIOC_SARCOM+2,struct atmif_sioc)
  90                                         /* get loopback mode */
  91 #define ATM_SETLOOP     _IOW('a',ATMIOC_SARCOM+3,struct atmif_sioc)
  92                                         /* set loopback mode */
  93 #define ATM_QUERYLOOP   _IOW('a',ATMIOC_SARCOM+4,struct atmif_sioc)
  94                                         /* query supported loopback modes */
  95 #define ATM_SETSC       _IOW('a',ATMIOC_SPECIAL+1,int)
  96                                         /* enable or disable single-copy */
  97 #define ATM_SETBACKEND  _IOW('a',ATMIOC_SPECIAL+2,atm_backend_t)
  98                                         /* set backend handler */
  99 #define ATM_NEWBACKENDIF _IOW('a',ATMIOC_SPECIAL+3,atm_backend_t)
 100                                         /* use backend to make new if */
 101 #define ATM_ADDPARTY    _IOW('a', ATMIOC_SPECIAL+4,struct atm_iobuf)
 102                                         /* add party to p2mp call */
 103 #ifdef CONFIG_COMPAT
 104 /* It actually takes struct sockaddr_atmsvc, not struct atm_iobuf */
 105 #define COMPAT_ATM_ADDPARTY     _IOW('a', ATMIOC_SPECIAL+4,struct compat_atm_iobuf)
 106 #endif
 107 #define ATM_DROPPARTY   _IOW('a', ATMIOC_SPECIAL+5,int)
 108                                         /* drop party from p2mp call */
 109
 110 /*
 111  * These are backend handkers that can be set via the ATM_SETBACKEND call
 112  * above.  In the future we may support dynamic loading of these - for now,
 113  * they're just being used to share the ATMIOC_BACKEND ioctls
 114  */
 115 #define ATM_BACKEND_RAW         0
 116 #define ATM_BACKEND_PPP         1       /* PPPoATM - RFC2364 */
 117 #define ATM_BACKEND_BR2684      2       /* Bridged RFC1483/2684 */
 118
 119 /* for ATM_GETTYPE */
 120 #define ATM_ITFTYP_LEN  8       /* maximum length of interface type name */
 121
 122 /*
 123  * Loopback modes for ATM_{PHY,SAR}_{GET,SET}LOOP
 124  */
 125
 126 /* Point of loopback                            CPU-->SAR-->PHY-->line--> ... */
 127 #define __ATM_LM_NONE   0       /* no loop back     ^     ^     ^      ^      */
 128 #define __ATM_LM_AAL    1       /* loop back PDUs --'     |     |      |      */
 129 #define __ATM_LM_ATM    2       /* loop back ATM cells ---'     |      |      */
 130 /* RESERVED             4       loop back on PHY side  ---'                   */
 131 #define __ATM_LM_PHY    8       /* loop back bits (digital) ----'      |      */
 132 #define __ATM_LM_ANALOG 16      /* loop back the analog signal --------'      */
 133
 134 /* Direction of loopback */
 135 #define __ATM_LM_MKLOC(n)       ((n))       /* Local (i.e. loop TX to RX) */
 136 #define __ATM_LM_MKRMT(n)       ((n) << 8)  /* Remote (i.e. loop RX to TX) */
 137
 138 #define __ATM_LM_XTLOC(n)       ((n) & 0xff)
 139 #define __ATM_LM_XTRMT(n)       (((n) >> 8) & 0xff)
 140
 141 #define ATM_LM_NONE     0       /* no loopback */
 142
 143 #define ATM_LM_LOC_AAL  __ATM_LM_MKLOC(__ATM_LM_AAL)
 144 #define ATM_LM_LOC_ATM  __ATM_LM_MKLOC(__ATM_LM_ATM)
 145 #define ATM_LM_LOC_PHY  __ATM_LM_MKLOC(__ATM_LM_PHY)
 146 #define ATM_LM_LOC_ANALOG __ATM_LM_MKLOC(__ATM_LM_ANALOG)
 147
 148 #define ATM_LM_RMT_AAL  __ATM_LM_MKRMT(__ATM_LM_AAL)
 149 #define ATM_LM_RMT_ATM  __ATM_LM_MKRMT(__ATM_LM_ATM)
 150 #define ATM_LM_RMT_PHY  __ATM_LM_MKRMT(__ATM_LM_PHY)
 151 #define ATM_LM_RMT_ANALOG __ATM_LM_MKRMT(__ATM_LM_ANALOG)
 152
 153 /*
 154  * Note: ATM_LM_LOC_* and ATM_LM_RMT_* can be combined, provided that
 155  * __ATM_LM_XTLOC(x) <= __ATM_LM_XTRMT(x)
 156  */
 157
 158
 159 struct atm_iobuf {
 160         int length;
 161         void __user *buffer;
 162 };
 163
 164 /* for ATM_GETCIRANGE / ATM_SETCIRANGE */
 165
 166 #define ATM_CI_MAX      -1              /* use maximum range of VPI/VCI */
 167
 168 struct atm_cirange {
 169         signed char     vpi_bits;       /* 1..8, ATM_CI_MAX (-1) for maximum */
 170         signed char     vci_bits;       /* 1..16, ATM_CI_MAX (-1) for maximum */
 171 };
 172
 173 /* for ATM_SETSC; actually taken from the ATM_VF number space */
 174
 175 #define ATM_SC_RX       1024            /* enable RX single-copy */
 176 #define ATM_SC_TX       2048            /* enable TX single-copy */
 177
 178 #define ATM_BACKLOG_DEFAULT 32 /* if we get more, we're likely to time out
 179                                   anyway */
 180
 181 /* MF: change_qos (Modify) flags */
 182
 183 #define ATM_MF_IMMED     1      /* Block until change is effective */
 184 #define ATM_MF_INC_RSV   2      /* Change reservation on increase */
 185 #define ATM_MF_INC_SHP   4      /* Change shaping on increase */
 186 #define ATM_MF_DEC_RSV   8      /* Change reservation on decrease */
 187 #define ATM_MF_DEC_SHP  16      /* Change shaping on decrease */
 188 #define ATM_MF_BWD      32      /* Set the backward direction parameters */
 189
 190 #define ATM_MF_SET      (ATM_MF_INC_RSV | ATM_MF_INC_SHP | ATM_MF_DEC_RSV | \
 191                           ATM_MF_DEC_SHP | ATM_MF_BWD)
 192
 193 /*
 194  * ATM_VS_* are used to express VC state in a human-friendly way.
 195  */
 196
 197 #define ATM_VS_IDLE     0       /* VC is not used */
 198 #define ATM_VS_CONNECTED 1      /* VC is connected */
 199 #define ATM_VS_CLOSING  2       /* VC is closing */
 200 #define ATM_VS_LISTEN   3       /* VC is listening for incoming setups */
 201 #define ATM_VS_INUSE    4       /* VC is in use (registered with atmsigd) */
 202 #define ATM_VS_BOUND    5       /* VC is bound */
 203
 204 #define ATM_VS2TXT_MAP \
 205     "IDLE", "CONNECTED", "CLOSING", "LISTEN", "INUSE", "BOUND"
 206
 207 #define ATM_VF2TXT_MAP \
 208     "ADDR",     "READY",        "PARTIAL",      "REGIS", \
 209     "RELEASED", "HASQOS",       "LISTEN",       "META", \
 210     "256",      "512",          "1024",         "2048", \
 211     "SESSION",  "HASSAP",       "BOUND",        "CLOSE"
 212
 213
 214 #ifdef __KERNEL__
 215
 216 #include <linux/device.h>
 217 #include <linux/wait.h> /* wait_queue_head_t */
 218 #include <linux/time.h> /* struct timeval */
 219 #include <linux/net.h>
 220 #include <linux/skbuff.h> /* struct sk_buff */
 221 #include <linux/uio.h>
 222 #include <net/sock.h>
 223 #include <asm/atomic.h>
 224
 225 #ifdef CONFIG_PROC_FS
 226 #include <linux/proc_fs.h>
 227
 228 extern struct proc_dir_entry *atm_proc_root;
 229 #endif
 230
 231 #ifdef CONFIG_COMPAT
 232 #include <linux/compat.h>
 233 struct compat_atm_iobuf {
 234         int length;
 235         compat_uptr_t buffer;
 236 };
 237 #endif
 238
 239 struct k_atm_aal_stats {
 240 #define __HANDLE_ITEM(i) atomic_t i
 241         __AAL_STAT_ITEMS
 242 #undef __HANDLE_ITEM
 243 };
 244
 245
 246 struct k_atm_dev_stats {
 247         struct k_atm_aal_stats aal0;
 248         struct k_atm_aal_stats aal34;
 249         struct k_atm_aal_stats aal5;
 250 };
 251
 252
 253 enum {
 254         ATM_VF_ADDR,            /* Address is in use. Set by anybody, cleared
 255                                    by device driver. */
 256         ATM_VF_READY,           /* VC is ready to transfer data. Set by device
 257                                    driver, cleared by anybody. */
 258         ATM_VF_PARTIAL,         /* resources are bound to PVC (partial PVC
 259                                    setup), controlled by socket layer */
 260         ATM_VF_REGIS,           /* registered with demon, controlled by SVC
 261                                    socket layer */
 262         ATM_VF_BOUND,           /* local SAP is set, controlled by SVC socket
 263                                    layer */
 264         ATM_VF_RELEASED,        /* demon has indicated/requested release,
 265                                    controlled by SVC socket layer */
 266         ATM_VF_HASQOS,          /* QOS parameters have been set */
 267         ATM_VF_LISTEN,          /* socket is used for listening */
 268         ATM_VF_META,            /* SVC socket isn't used for normal data
 269                                    traffic and doesn't depend on signaling
 270                                    to be available */
 271         ATM_VF_SESSION,         /* VCC is p2mp session control descriptor */
 272         ATM_VF_HASSAP,          /* SAP has been set */
 273         ATM_VF_CLOSE,           /* asynchronous close - treat like VF_RELEASED*/
 274         ATM_VF_WAITING,         /* waiting for reply from sigd */
 275         ATM_VF_IS_CLIP,         /* in use by CLIP protocol */
 276 };
 277
 278
 279 #define ATM_VF2VS(flags) \
 280     (test_bit(ATM_VF_READY,&(flags)) ? ATM_VS_CONNECTED : \
 281      test_bit(ATM_VF_RELEASED,&(flags)) ? ATM_VS_CLOSING : \
 282      test_bit(ATM_VF_LISTEN,&(flags)) ? ATM_VS_LISTEN : \
 283      test_bit(ATM_VF_REGIS,&(flags)) ? ATM_VS_INUSE : \
 284      test_bit(ATM_VF_BOUND,&(flags)) ? ATM_VS_BOUND : ATM_VS_IDLE)
 285
 286
 287 enum {
 288         ATM_DF_REMOVED,         /* device was removed from atm_devs list */
 289 };
 290
 291
 292 #define ATM_PHY_SIG_LOST    0   /* no carrier/light */
 293 #define ATM_PHY_SIG_UNKNOWN 1   /* carrier/light status is unknown */
 294 #define ATM_PHY_SIG_FOUND   2   /* carrier/light okay */
 295
 296 #define ATM_ATMOPT_CLP  1       /* set CLP bit */
 297
 298 struct atm_vcc {
 299         /* struct sock has to be the first member of atm_vcc */
 300         struct sock     sk;
 301         unsigned long   flags;          /* VCC flags (ATM_VF_*) */
 302         short           vpi;            /* VPI and VCI (types must be equal */
 303                                         /* with sockaddr) */
 304         int             vci;
 305         unsigned long   aal_options;    /* AAL layer options */
 306         unsigned long   atm_options;    /* ATM layer options */
 307         struct atm_dev  *dev;           /* device back pointer */
 308         struct atm_qos  qos;            /* QOS */
 309         struct atm_sap  sap;            /* SAP */
 310         void (*push)(struct atm_vcc *vcc,struct sk_buff *skb);
 311         void (*pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* optional */
 312         int (*push_oam)(struct atm_vcc *vcc,void *cell);
 313         int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
 314         void            *dev_data;      /* per-device data */
 315         void            *proto_data;    /* per-protocol data */
 316         struct k_atm_aal_stats *stats;  /* pointer to AAL stats group */
 317         /* SVC part --- may move later ------------------------------------- */
 318         short           itf;            /* interface number */
 319         struct sockaddr_atmsvc local;
 320         struct sockaddr_atmsvc remote;
 321         /* Multipoint part ------------------------------------------------- */
 322         struct atm_vcc  *session;       /* session VCC descriptor */
 323         /* Other stuff ----------------------------------------------------- */
 324         void            *user_back;     /* user backlink - not touched by */
 325                                         /* native ATM stack. Currently used */
 326                                         /* by CLIP and sch_atm. */
 327 };
 328
 329 static inline struct atm_vcc *atm_sk(struct sock *sk)
 330 {
 331         return (struct atm_vcc *)sk;
 332 }
 333
 334 static inline struct atm_vcc *ATM_SD(struct socket *sock)
 335 {
 336         return atm_sk(sock->sk);
 337 }
 338
 339 static inline struct sock *sk_atm(struct atm_vcc *vcc)
 340 {
 341         return (struct sock *)vcc;
 342 }
 343
 344 struct atm_dev_addr {
 345         struct sockaddr_atmsvc addr;    /* ATM address */
 346         struct list_head entry;         /* next address */
 347 };
 348
 349 enum atm_addr_type_t { ATM_ADDR_LOCAL, ATM_ADDR_LECS };
 350
 351 struct atm_dev {
 352         const struct atmdev_ops *ops;   /* device operations; NULL if unused */
 353         const struct atmphy_ops *phy;   /* PHY operations, may be undefined */
 354                                         /* (NULL) */
 355         const char      *type;          /* device type name */
 356         int             number;         /* device index */
 357         void            *dev_data;      /* per-device data */
 358         void            *phy_data;      /* private PHY date */
 359         unsigned long   flags;          /* device flags (ATM_DF_*) */
 360         struct list_head local;         /* local ATM addresses */
 361         struct list_head lecs;          /* LECS ATM addresses learned via ILMI */
 362         unsigned char   esi[ESI_LEN];   /* ESI ("MAC" addr) */
 363         struct atm_cirange ci_range;    /* VPI/VCI range */
 364         struct k_atm_dev_stats stats;   /* statistics */
 365         char            signal;         /* signal status (ATM_PHY_SIG_*) */
 366         int             link_rate;      /* link rate (default: OC3) */
 367         atomic_t        refcnt;         /* reference count */
 368         spinlock_t      lock;           /* protect internal members */
 369 #ifdef CONFIG_PROC_FS
 370         struct proc_dir_entry *proc_entry; /* proc entry */
 371         char *proc_name;                /* proc entry name */
 372 #endif
 373         struct device class_dev;        /* sysfs device */
 374         struct list_head dev_list;      /* linkage */
 375 };
 376
 377
 378 /* OF: send_Oam Flags */
 379
 380 #define ATM_OF_IMMED  1         /* Attempt immediate delivery */
 381 #define ATM_OF_INRATE 2         /* Attempt in-rate delivery */
 382
 383
 384 /*
 385  * ioctl, getsockopt, and setsockopt are optional and can be set to NULL.
 386  */
 387
 388 struct atmdev_ops { /* only send is required */
 389         void (*dev_close)(struct atm_dev *dev);
 390         int (*open)(struct atm_vcc *vcc);
 391         void (*close)(struct atm_vcc *vcc);
 392         int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
 393 #ifdef CONFIG_COMPAT
 394         int (*compat_ioctl)(struct atm_dev *dev,unsigned int cmd,
 395                             void __user *arg);
 396 #endif
 397         int (*getsockopt)(struct atm_vcc *vcc,int level,int optname,
 398             void __user *optval,int optlen);
 399         int (*setsockopt)(struct atm_vcc *vcc,int level,int optname,
 400             void __user *optval,unsigned int optlen);
 401         int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
 402         int (*send_oam)(struct atm_vcc *vcc,void *cell,int flags);
 403         void (*phy_put)(struct atm_dev *dev,unsigned char value,
 404             unsigned long addr);
 405         unsigned char (*phy_get)(struct atm_dev *dev,unsigned long addr);
 406         int (*change_qos)(struct atm_vcc *vcc,struct atm_qos *qos,int flags);
 407         int (*proc_read)(struct atm_dev *dev,loff_t *pos,char *page);
 408         struct module *owner;
 409 };
 410
 411 struct atmphy_ops {
 412         int (*start)(struct atm_dev *dev);
 413         int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
 414         void (*interrupt)(struct atm_dev *dev);
 415         int (*stop)(struct atm_dev *dev);
 416 };
 417
 418 struct atm_skb_data {
 419         struct atm_vcc  *vcc;           /* ATM VCC */
 420         unsigned long   atm_options;    /* ATM layer options */
 421 };
 422
 423 #define VCC_HTABLE_SIZE 32
 424
 425 extern struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
 426 extern rwlock_t vcc_sklist_lock;
 427
 428 #define ATM_SKB(skb) (((struct atm_skb_data *) (skb)->cb))
 429
 430 struct atm_dev *atm_dev_register(const char *type,const struct atmdev_ops *ops,
 431     int number,unsigned long *flags); /* number == -1: pick first available */
 432 struct atm_dev *atm_dev_lookup(int number);
 433 void atm_dev_deregister(struct atm_dev *dev);
 434 void vcc_insert_socket(struct sock *sk);
 435
 436
 437 /*
 438  * This is approximately the algorithm used by alloc_skb.
 439  *
 440  */
 441
 442 static inline int atm_guess_pdu2truesize(int size)
 443 {
 444         return (SKB_DATA_ALIGN(size) + sizeof(struct skb_shared_info));
 445 }
 446
 447
 448 static inline void atm_force_charge(struct atm_vcc *vcc,int truesize)
 449 {
 450         atomic_add(truesize, &sk_atm(vcc)->sk_rmem_alloc);
 451 }
 452
 453
 454 static inline void atm_return(struct atm_vcc *vcc,int truesize)
 455 {
 456         atomic_sub(truesize, &sk_atm(vcc)->sk_rmem_alloc);
 457 }
 458
 459
 460 static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size)
 461 {
 462         return (size + atomic_read(&sk_atm(vcc)->sk_wmem_alloc)) <
 463                sk_atm(vcc)->sk_sndbuf;
 464 }
 465
 466
 467 static inline void atm_dev_hold(struct atm_dev *dev)
 468 {
 469         atomic_inc(&dev->refcnt);
 470 }
 471
 472
 473 static inline void atm_dev_put(struct atm_dev *dev)
 474 {
 475         if (atomic_dec_and_test(&dev->refcnt)) {
 476                 BUG_ON(!test_bit(ATM_DF_REMOVED, &dev->flags));
 477                 if (dev->ops->dev_close)
 478                         dev->ops->dev_close(dev);
 479                 put_device(&dev->class_dev);
 480         }
 481 }
 482
 483
 484 int atm_charge(struct atm_vcc *vcc,int truesize);
 485 struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
 486     gfp_t gfp_flags);
 487 int atm_pcr_goal(const struct atm_trafprm *tp);
 488
 489 void vcc_release_async(struct atm_vcc *vcc, int reply);
 490
 491 struct atm_ioctl {
 492         struct module *owner;
 493         /* A module reference is kept if appropriate over this call.
 494          * Return -ENOIOCTLCMD if you don't handle it. */
 495         int (*ioctl)(struct socket *, unsigned int cmd, unsigned long arg);
 496         struct list_head list;
 497 };
 498
 499 /**
 500  * register_atm_ioctl - register handler for ioctl operations
 501  *
 502  * Special (non-device) handlers of ioctl's should
 503  * register here. If you're a normal device, you should
 504  * set .ioctl in your atmdev_ops instead.
 505  */
 506 void register_atm_ioctl(struct atm_ioctl *);
 507
 508 /**
 509  * deregister_atm_ioctl - remove the ioctl handler
 510  */
 511 void deregister_atm_ioctl(struct atm_ioctl *);
 512
 513 #endif /* __KERNEL__ */
 514
 515 #endif