include/linux/parport.h

   1 /* $Id: parport.h,v 1.1 1998/05/17 10:57:52 andrea Exp andrea $ */
   2
   3 /*
   4  * Any part of this program may be used in documents licensed under
   5  * the GNU Free Documentation License, Version 1.1 or any later version
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef _PARPORT_H_
  10 #define _PARPORT_H_
  11
  12 /* Start off with user-visible constants */
  13
  14 /* Maximum of 16 ports per machine */
  15 #define PARPORT_MAX  16
  16
  17 /* Magic numbers */
  18 #define PARPORT_IRQ_NONE  -1
  19 #define PARPORT_DMA_NONE  -1
  20 #define PARPORT_IRQ_AUTO  -2
  21 #define PARPORT_DMA_AUTO  -2
  22 #define PARPORT_DMA_NOFIFO -3
  23 #define PARPORT_DISABLE   -2
  24 #define PARPORT_IRQ_PROBEONLY -3
  25 #define PARPORT_IOHI_AUTO -1
  26
  27 #define PARPORT_CONTROL_STROBE    0x1
  28 #define PARPORT_CONTROL_AUTOFD    0x2
  29 #define PARPORT_CONTROL_INIT      0x4
  30 #define PARPORT_CONTROL_SELECT    0x8
  31
  32 #define PARPORT_STATUS_ERROR      0x8
  33 #define PARPORT_STATUS_SELECT     0x10
  34 #define PARPORT_STATUS_PAPEROUT   0x20
  35 #define PARPORT_STATUS_ACK        0x40
  36 #define PARPORT_STATUS_BUSY       0x80
  37
  38 /* Type classes for Plug-and-Play probe.  */
  39 typedef enum {
  40         PARPORT_CLASS_LEGACY = 0,       /* Non-IEEE1284 device */
  41         PARPORT_CLASS_PRINTER,
  42         PARPORT_CLASS_MODEM,
  43         PARPORT_CLASS_NET,
  44         PARPORT_CLASS_HDC,              /* Hard disk controller */
  45         PARPORT_CLASS_PCMCIA,
  46         PARPORT_CLASS_MEDIA,            /* Multimedia device */
  47         PARPORT_CLASS_FDC,              /* Floppy disk controller */
  48         PARPORT_CLASS_PORTS,
  49         PARPORT_CLASS_SCANNER,
  50         PARPORT_CLASS_DIGCAM,
  51         PARPORT_CLASS_OTHER,            /* Anything else */
  52         PARPORT_CLASS_UNSPEC,           /* No CLS field in ID */
  53         PARPORT_CLASS_SCSIADAPTER
  54 } parport_device_class;
  55
  56 /* The "modes" entry in parport is a bit field representing the
  57    capabilities of the hardware. */
  58 #define PARPORT_MODE_PCSPP      (1<<0) /* IBM PC registers available. */
  59 #define PARPORT_MODE_TRISTATE   (1<<1) /* Can tristate. */
  60 #define PARPORT_MODE_EPP        (1<<2) /* Hardware EPP. */
  61 #define PARPORT_MODE_ECP        (1<<3) /* Hardware ECP. */
  62 #define PARPORT_MODE_COMPAT     (1<<4) /* Hardware 'printer protocol'. */
  63 #define PARPORT_MODE_DMA        (1<<5) /* Hardware can DMA. */
  64 #define PARPORT_MODE_SAFEININT  (1<<6) /* SPP registers accessible in IRQ. */
  65
  66 /* IEEE1284 modes:
  67    Nibble mode, byte mode, ECP, ECPRLE and EPP are their own
  68    'extensibility request' values.  Others are special.
  69    'Real' ECP modes must have the IEEE1284_MODE_ECP bit set.  */
  70 #define IEEE1284_MODE_NIBBLE             0
  71 #define IEEE1284_MODE_BYTE              (1<<0)
  72 #define IEEE1284_MODE_COMPAT            (1<<8)
  73 #define IEEE1284_MODE_BECP              (1<<9) /* Bounded ECP mode */
  74 #define IEEE1284_MODE_ECP               (1<<4)
  75 #define IEEE1284_MODE_ECPRLE            (IEEE1284_MODE_ECP | (1<<5))
  76 #define IEEE1284_MODE_ECPSWE            (1<<10) /* Software-emulated */
  77 #define IEEE1284_MODE_EPP               (1<<6)
  78 #define IEEE1284_MODE_EPPSL             (1<<11) /* EPP 1.7 */
  79 #define IEEE1284_MODE_EPPSWE            (1<<12) /* Software-emulated */
  80 #define IEEE1284_DEVICEID               (1<<2)  /* This is a flag */
  81 #define IEEE1284_EXT_LINK               (1<<14) /* This flag causes the
  82                                                  * extensibility link to
  83                                                  * be requested, using
  84                                                  * bits 0-6. */
  85
  86 /* For the benefit of parport_read/write, you can use these with
  87  * parport_negotiate to use address operations.  They have no effect
  88  * other than to make parport_read/write use address transfers. */
  89 #define IEEE1284_ADDR                   (1<<13) /* This is a flag */
  90 #define IEEE1284_DATA                    0      /* So is this */
  91
  92 /* Flags for block transfer operations. */
  93 #define PARPORT_EPP_FAST                (1<<0) /* Unreliable counts. */
  94 #define PARPORT_W91284PIC               (1<<1) /* have a Warp9 w91284pic in the device */
  95
  96 /* The rest is for the kernel only */
  97 #ifdef __KERNEL__
  98
  99 #include <linux/jiffies.h>
 100 #include <linux/proc_fs.h>
 101 #include <linux/spinlock.h>
 102 #include <linux/wait.h>
 103 #include <linux/irqreturn.h>
 104 #include <linux/semaphore.h>
 105 #include <asm/system.h>
 106 #include <asm/ptrace.h>
 107
 108 /* Define this later. */
 109 struct parport;
 110 struct pardevice;
 111
 112 struct pc_parport_state {
 113         unsigned int ctr;
 114         unsigned int ecr;
 115 };
 116
 117 struct ax_parport_state {
 118         unsigned int ctr;
 119         unsigned int ecr;
 120         unsigned int dcsr;
 121 };
 122
 123 /* used by both parport_amiga and parport_mfc3 */
 124 struct amiga_parport_state {
 125        unsigned char data;     /* ciaa.prb */
 126        unsigned char datadir;  /* ciaa.ddrb */
 127        unsigned char status;   /* ciab.pra & 7 */
 128        unsigned char statusdir;/* ciab.ddrb & 7 */
 129 };
 130
 131 struct ax88796_parport_state {
 132         unsigned char cpr;
 133 };
 134
 135 struct ip32_parport_state {
 136         unsigned int dcr;
 137         unsigned int ecr;
 138 };
 139
 140 struct parport_state {
 141         union {
 142                 struct pc_parport_state pc;
 143                 /* ARC has no state. */
 144                 struct ax_parport_state ax;
 145                 struct amiga_parport_state amiga;
 146                 struct ax88796_parport_state ax88796;
 147                 /* Atari has not state. */
 148                 struct ip32_parport_state ip32;
 149                 void *misc;
 150         } u;
 151 };
 152
 153 struct parport_operations {
 154         /* IBM PC-style virtual registers. */
 155         void (*write_data)(struct parport *, unsigned char);
 156         unsigned char (*read_data)(struct parport *);
 157
 158         void (*write_control)(struct parport *, unsigned char);
 159         unsigned char (*read_control)(struct parport *);
 160         unsigned char (*frob_control)(struct parport *, unsigned char mask,
 161                                       unsigned char val);
 162
 163         unsigned char (*read_status)(struct parport *);
 164
 165         /* IRQs. */
 166         void (*enable_irq)(struct parport *);
 167         void (*disable_irq)(struct parport *);
 168
 169         /* Data direction. */
 170         void (*data_forward) (struct parport *);
 171         void (*data_reverse) (struct parport *);
 172
 173         /* For core parport code. */
 174         void (*init_state)(struct pardevice *, struct parport_state *);
 175         void (*save_state)(struct parport *, struct parport_state *);
 176         void (*restore_state)(struct parport *, struct parport_state *);
 177
 178         /* Block read/write */
 179         size_t (*epp_write_data) (struct parport *port, const void *buf,
 180                                   size_t len, int flags);
 181         size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
 182                                  int flags);
 183         size_t (*epp_write_addr) (struct parport *port, const void *buf,
 184                                   size_t len, int flags);
 185         size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
 186                                  int flags);
 187
 188         size_t (*ecp_write_data) (struct parport *port, const void *buf,
 189                                   size_t len, int flags);
 190         size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
 191                                  int flags);
 192         size_t (*ecp_write_addr) (struct parport *port, const void *buf,
 193                                   size_t len, int flags);
 194
 195         size_t (*compat_write_data) (struct parport *port, const void *buf,
 196                                      size_t len, int flags);
 197         size_t (*nibble_read_data) (struct parport *port, void *buf,
 198                                     size_t len, int flags);
 199         size_t (*byte_read_data) (struct parport *port, void *buf,
 200                                   size_t len, int flags);
 201         struct module *owner;
 202 };
 203
 204 struct parport_device_info {
 205         parport_device_class class;
 206         const char *class_name;
 207         const char *mfr;
 208         const char *model;
 209         const char *cmdset;
 210         const char *description;
 211 };
 212
 213 /* Each device can have two callback functions:
 214  *  1) a preemption function, called by the resource manager to request
 215  *     that the driver relinquish control of the port.  The driver should
 216  *     return zero if it agrees to release the port, and nonzero if it
 217  *     refuses.  Do not call parport_release() - the kernel will do this
 218  *     implicitly.
 219  *
 220  *  2) a wake-up function, called by the resource manager to tell drivers
 221  *     that the port is available to be claimed.  If a driver wants to use
 222  *     the port, it should call parport_claim() here.
 223  */
 224
 225 /* A parallel port device */
 226 struct pardevice {
 227         const char *name;
 228         struct parport *port;
 229         int daisy;
 230         int (*preempt)(void *);
 231         void (*wakeup)(void *);
 232         void *private;
 233         void (*irq_func)(void *);
 234         unsigned int flags;
 235         struct pardevice *next;
 236         struct pardevice *prev;
 237         struct parport_state *state;     /* saved status over preemption */
 238         wait_queue_head_t wait_q;
 239         unsigned long int time;
 240         unsigned long int timeslice;
 241         volatile long int timeout;
 242         unsigned long waiting;           /* long req'd for set_bit --RR */
 243         struct pardevice *waitprev;
 244         struct pardevice *waitnext;
 245         void * sysctl_table;
 246 };
 247
 248 /* IEEE1284 information */
 249
 250 /* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
 251  * PP[GS]ETPHASE, so do not change existing values. */
 252 enum ieee1284_phase {
 253         IEEE1284_PH_FWD_DATA,
 254         IEEE1284_PH_FWD_IDLE,
 255         IEEE1284_PH_TERMINATE,
 256         IEEE1284_PH_NEGOTIATION,
 257         IEEE1284_PH_HBUSY_DNA,
 258         IEEE1284_PH_REV_IDLE,
 259         IEEE1284_PH_HBUSY_DAVAIL,
 260         IEEE1284_PH_REV_DATA,
 261         IEEE1284_PH_ECP_SETUP,
 262         IEEE1284_PH_ECP_FWD_TO_REV,
 263         IEEE1284_PH_ECP_REV_TO_FWD,
 264         IEEE1284_PH_ECP_DIR_UNKNOWN,
 265 };
 266 struct ieee1284_info {
 267         int mode;
 268         volatile enum ieee1284_phase phase;
 269         struct semaphore irq;
 270 };
 271
 272 /* A parallel port */
 273 struct parport {
 274         unsigned long base;     /* base address */
 275         unsigned long base_hi;  /* base address (hi - ECR) */
 276         unsigned int size;      /* IO extent */
 277         const char *name;
 278         unsigned int modes;
 279         int irq;                /* interrupt (or -1 for none) */
 280         int dma;
 281         int muxport;            /* which muxport (if any) this is */
 282         int portnum;            /* which physical parallel port (not mux) */
 283         struct device *dev;     /* Physical device associated with IO/DMA.
 284                                  * This may unfortulately be null if the
 285                                  * port has a legacy driver.
 286                                  */
 287
 288         struct parport *physport;
 289                                 /* If this is a non-default mux
 290                                    parport, i.e. we're a clone of a real
 291                                    physical port, this is a pointer to that
 292                                    port. The locking is only done in the
 293                                    real port.  For a clone port, the
 294                                    following structure members are
 295                                    meaningless: devices, cad, muxsel,
 296                                    waithead, waittail, flags, pdir,
 297                                    dev, ieee1284, *_lock.
 298
 299                                    It this is a default mux parport, or
 300                                    there is no mux involved, this points to
 301                                    ourself. */
 302
 303         struct pardevice *devices;
 304         struct pardevice *cad;  /* port owner */
 305         int daisy;              /* currently selected daisy addr */
 306         int muxsel;             /* currently selected mux port */
 307
 308         struct pardevice *waithead;
 309         struct pardevice *waittail;
 310
 311         struct list_head list;
 312         unsigned int flags;
 313
 314         void *sysctl_table;
 315         struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */
 316         struct ieee1284_info ieee1284;
 317
 318         struct parport_operations *ops;
 319         void *private_data;     /* for lowlevel driver */
 320
 321         int number;             /* port index - the `n' in `parportn' */
 322         spinlock_t pardevice_lock;
 323         spinlock_t waitlist_lock;
 324         rwlock_t cad_lock;
 325
 326         int spintime;
 327         atomic_t ref_count;
 328
 329         struct list_head full_list;
 330         struct parport *slaves[3];
 331 };
 332
 333 #define DEFAULT_SPIN_TIME 500 /* us */
 334
 335 struct parport_driver {
 336         const char *name;
 337         void (*attach) (struct parport *);
 338         void (*detach) (struct parport *);
 339         struct list_head list;
 340 };
 341
 342 /* parport_register_port registers a new parallel port at the given
 343    address (if one does not already exist) and returns a pointer to it.
 344    This entails claiming the I/O region, IRQ and DMA.  NULL is returned
 345    if initialisation fails. */
 346 struct parport *parport_register_port(unsigned long base, int irq, int dma,
 347                                       struct parport_operations *ops);
 348
 349 /* Once a registered port is ready for high-level drivers to use, the
 350    low-level driver that registered it should announce it.  This will
 351    call the high-level drivers' attach() functions (after things like
 352    determining the IEEE 1284.3 topology of the port and collecting
 353    DeviceIDs). */
 354 void parport_announce_port (struct parport *port);
 355
 356 /* Unregister a port. */
 357 extern void parport_remove_port(struct parport *port);
 358
 359 /* Register a new high-level driver. */
 360 extern int parport_register_driver (struct parport_driver *);
 361
 362 /* Unregister a high-level driver. */
 363 extern void parport_unregister_driver (struct parport_driver *);
 364
 365 /* If parport_register_driver doesn't fit your needs, perhaps
 366  * parport_find_xxx does. */
 367 extern struct parport *parport_find_number (int);
 368 extern struct parport *parport_find_base (unsigned long);
 369
 370 /* generic irq handler, if it suits your needs */
 371 extern irqreturn_t parport_irq_handler(int irq, void *dev_id);
 372
 373 /* Reference counting for ports. */
 374 extern struct parport *parport_get_port (struct parport *);
 375 extern void parport_put_port (struct parport *);
 376
 377 /* parport_register_device declares that a device is connected to a
 378    port, and tells the kernel all it needs to know.
 379    - pf is the preemption function (may be NULL for no callback)
 380    - kf is the wake-up function (may be NULL for no callback)
 381    - irq_func is the interrupt handler (may be NULL for no interrupts)
 382    - handle is a user pointer that gets handed to callback functions.  */
 383 struct pardevice *parport_register_device(struct parport *port,
 384                           const char *name,
 385                           int (*pf)(void *), void (*kf)(void *),
 386                           void (*irq_func)(void *),
 387                           int flags, void *handle);
 388
 389 /* parport_unregister unlinks a device from the chain. */
 390 extern void parport_unregister_device(struct pardevice *dev);
 391
 392 /* parport_claim tries to gain ownership of the port for a particular
 393    driver.  This may fail (return non-zero) if another driver is busy.
 394    If this driver has registered an interrupt handler, it will be
 395    enabled.  */
 396 extern int parport_claim(struct pardevice *dev);
 397
 398 /* parport_claim_or_block is the same, but sleeps if the port cannot
 399    be claimed.  Return value is 1 if it slept, 0 normally and -errno
 400    on error.  */
 401 extern int parport_claim_or_block(struct pardevice *dev);
 402
 403 /* parport_release reverses a previous parport_claim.  This can never
 404    fail, though the effects are undefined (except that they are bad)
 405    if you didn't previously own the port.  Once you have released the
 406    port you should make sure that neither your code nor the hardware
 407    on the port tries to initiate any communication without first
 408    re-claiming the port.  If you mess with the port state (enabling
 409    ECP for example) you should clean up before releasing the port. */
 410
 411 extern void parport_release(struct pardevice *dev);
 412
 413 /**
 414  * parport_yield - relinquish a parallel port temporarily
 415  * @dev: a device on the parallel port
 416  *
 417  * This function relinquishes the port if it would be helpful to other
 418  * drivers to do so.  Afterwards it tries to reclaim the port using
 419  * parport_claim(), and the return value is the same as for
 420  * parport_claim().  If it fails, the port is left unclaimed and it is
 421  * the driver's responsibility to reclaim the port.
 422  *
 423  * The parport_yield() and parport_yield_blocking() functions are for
 424  * marking points in the driver at which other drivers may claim the
 425  * port and use their devices.  Yielding the port is similar to
 426  * releasing it and reclaiming it, but is more efficient because no
 427  * action is taken if there are no other devices needing the port.  In
 428  * fact, nothing is done even if there are other devices waiting but
 429  * the current device is still within its "timeslice".  The default
 430  * timeslice is half a second, but it can be adjusted via the /proc
 431  * interface.
 432  **/
 433 static __inline__ int parport_yield(struct pardevice *dev)
 434 {
 435         unsigned long int timeslip = (jiffies - dev->time);
 436         if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
 437                 return 0;
 438         parport_release(dev);
 439         return parport_claim(dev);
 440 }
 441
 442 /**
 443  * parport_yield_blocking - relinquish a parallel port temporarily
 444  * @dev: a device on the parallel port
 445  *
 446  * This function relinquishes the port if it would be helpful to other
 447  * drivers to do so.  Afterwards it tries to reclaim the port using
 448  * parport_claim_or_block(), and the return value is the same as for
 449  * parport_claim_or_block().
 450  **/
 451 static __inline__ int parport_yield_blocking(struct pardevice *dev)
 452 {
 453         unsigned long int timeslip = (jiffies - dev->time);
 454         if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
 455                 return 0;
 456         parport_release(dev);
 457         return parport_claim_or_block(dev);
 458 }
 459
 460 /* Flags used to identify what a device does. */
 461 #define PARPORT_DEV_TRAN                0       /* WARNING !! DEPRECATED !! */
 462 #define PARPORT_DEV_LURK                (1<<0)  /* WARNING !! DEPRECATED !! */
 463 #define PARPORT_DEV_EXCL                (1<<1)  /* Need exclusive access. */
 464
 465 #define PARPORT_FLAG_EXCL               (1<<1)  /* EXCL driver registered. */
 466
 467 /* IEEE1284 functions */
 468 extern void parport_ieee1284_interrupt (void *);
 469 extern int parport_negotiate (struct parport *, int mode);
 470 extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
 471 extern ssize_t parport_read (struct parport *, void *buf, size_t len);
 472
 473 #define PARPORT_INACTIVITY_O_NONBLOCK 1
 474 extern long parport_set_timeout (struct pardevice *, long inactivity);
 475
 476 extern int parport_wait_event (struct parport *, long timeout);
 477 extern int parport_wait_peripheral (struct parport *port,
 478                                     unsigned char mask,
 479                                     unsigned char val);
 480 extern int parport_poll_peripheral (struct parport *port,
 481                                     unsigned char mask,
 482                                     unsigned char val,
 483                                     int usec);
 484
 485 /* For architectural drivers */
 486 extern size_t parport_ieee1284_write_compat (struct parport *,
 487                                              const void *, size_t, int);
 488 extern size_t parport_ieee1284_read_nibble (struct parport *,
 489                                             void *, size_t, int);
 490 extern size_t parport_ieee1284_read_byte (struct parport *,
 491                                           void *, size_t, int);
 492 extern size_t parport_ieee1284_ecp_read_data (struct parport *,
 493                                               void *, size_t, int);
 494 extern size_t parport_ieee1284_ecp_write_data (struct parport *,
 495                                                const void *, size_t, int);
 496 extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
 497                                                const void *, size_t, int);
 498 extern size_t parport_ieee1284_epp_write_data (struct parport *,
 499                                                const void *, size_t, int);
 500 extern size_t parport_ieee1284_epp_read_data (struct parport *,
 501                                               void *, size_t, int);
 502 extern size_t parport_ieee1284_epp_write_addr (struct parport *,
 503                                                const void *, size_t, int);
 504 extern size_t parport_ieee1284_epp_read_addr (struct parport *,
 505                                               void *, size_t, int);
 506
 507 /* IEEE1284.3 functions */
 508 extern int parport_daisy_init (struct parport *port);
 509 extern void parport_daisy_fini (struct parport *port);
 510 extern struct pardevice *parport_open (int devnum, const char *name);
 511 extern void parport_close (struct pardevice *dev);
 512 extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
 513 extern void parport_daisy_deselect_all (struct parport *port);
 514 extern int parport_daisy_select (struct parport *port, int daisy, int mode);
 515
 516 /* Lowlevel drivers _can_ call this support function to handle irqs.  */
 517 static inline void parport_generic_irq(struct parport *port)
 518 {
 519         parport_ieee1284_interrupt (port);
 520         read_lock(&port->cad_lock);
 521         if (port->cad && port->cad->irq_func)
 522                 port->cad->irq_func(port->cad->private);
 523         read_unlock(&port->cad_lock);
 524 }
 525
 526 /* Prototypes from parport_procfs */
 527 extern int parport_proc_register(struct parport *pp);
 528 extern int parport_proc_unregister(struct parport *pp);
 529 extern int parport_device_proc_register(struct pardevice *device);
 530 extern int parport_device_proc_unregister(struct pardevice *device);
 531
 532 /* If PC hardware is the only type supported, we can optimise a bit.  */
 533 #if !defined(CONFIG_PARPORT_NOT_PC)
 534
 535 #include <linux/parport_pc.h>
 536 #define parport_write_data(p,x)            parport_pc_write_data(p,x)
 537 #define parport_read_data(p)               parport_pc_read_data(p)
 538 #define parport_write_control(p,x)         parport_pc_write_control(p,x)
 539 #define parport_read_control(p)            parport_pc_read_control(p)
 540 #define parport_frob_control(p,m,v)        parport_pc_frob_control(p,m,v)
 541 #define parport_read_status(p)             parport_pc_read_status(p)
 542 #define parport_enable_irq(p)              parport_pc_enable_irq(p)
 543 #define parport_disable_irq(p)             parport_pc_disable_irq(p)
 544 #define parport_data_forward(p)            parport_pc_data_forward(p)
 545 #define parport_data_reverse(p)            parport_pc_data_reverse(p)
 546
 547 #else  /*  !CONFIG_PARPORT_NOT_PC  */
 548
 549 /* Generic operations vector through the dispatch table. */
 550 #define parport_write_data(p,x)            (p)->ops->write_data(p,x)
 551 #define parport_read_data(p)               (p)->ops->read_data(p)
 552 #define parport_write_control(p,x)         (p)->ops->write_control(p,x)
 553 #define parport_read_control(p)            (p)->ops->read_control(p)
 554 #define parport_frob_control(p,m,v)        (p)->ops->frob_control(p,m,v)
 555 #define parport_read_status(p)             (p)->ops->read_status(p)
 556 #define parport_enable_irq(p)              (p)->ops->enable_irq(p)
 557 #define parport_disable_irq(p)             (p)->ops->disable_irq(p)
 558 #define parport_data_forward(p)            (p)->ops->data_forward(p)
 559 #define parport_data_reverse(p)            (p)->ops->data_reverse(p)
 560
 561 #endif /*  !CONFIG_PARPORT_NOT_PC  */
 562
 563 extern unsigned long parport_default_timeslice;
 564 extern int parport_default_spintime;
 565
 566 #endif /* __KERNEL__ */
 567 #endif /* _PARPORT_H_ */