include/linux/parport.h

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