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/config.h>
 100 #include <linux/jiffies.h>
 101 #include <linux/proc_fs.h>
 102 #include <linux/spinlock.h>
 103 #include <linux/wait.h>
 104 #include <asm/system.h>
 105 #include <asm/ptrace.h>
 106 #include <asm/semaphore.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 ip32_parport_state {
 132         unsigned int dcr;
 133         unsigned int ecr;
 134 };
 135
 136 struct parport_state {
 137         union {
 138                 struct pc_parport_state pc;
 139                 /* ARC has no state. */
 140                 struct ax_parport_state ax;
 141                 struct amiga_parport_state amiga;
 142                 /* Atari has not state. */
 143                 struct ip32_parport_state ip32;
 144                 void *misc;
 145         } u;
 146 };
 147
 148 struct parport_operations {
 149         /* IBM PC-style virtual registers. */
 150         void (*write_data)(struct parport *, unsigned char);
 151         unsigned char (*read_data)(struct parport *);
 152
 153         void (*write_control)(struct parport *, unsigned char);
 154         unsigned char (*read_control)(struct parport *);
 155         unsigned char (*frob_control)(struct parport *, unsigned char mask,
 156                                       unsigned char val);
 157
 158         unsigned char (*read_status)(struct parport *);
 159
 160         /* IRQs. */
 161         void (*enable_irq)(struct parport *);
 162         void (*disable_irq)(struct parport *);
 163
 164         /* Data direction. */
 165         void (*data_forward) (struct parport *);
 166         void (*data_reverse) (struct parport *);
 167
 168         /* For core parport code. */
 169         void (*init_state)(struct pardevice *, struct parport_state *);
 170         void (*save_state)(struct parport *, struct parport_state *);
 171         void (*restore_state)(struct parport *, struct parport_state *);
 172
 173         /* Block read/write */
 174         size_t (*epp_write_data) (struct parport *port, const void *buf,
 175                                   size_t len, int flags);
 176         size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
 177                                  int flags);
 178         size_t (*epp_write_addr) (struct parport *port, const void *buf,
 179                                   size_t len, int flags);
 180         size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
 181                                  int flags);
 182
 183         size_t (*ecp_write_data) (struct parport *port, const void *buf,
 184                                   size_t len, int flags);
 185         size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
 186                                  int flags);
 187         size_t (*ecp_write_addr) (struct parport *port, const void *buf,
 188                                   size_t len, int flags);
 189
 190         size_t (*compat_write_data) (struct parport *port, const void *buf,
 191                                      size_t len, int flags);
 192         size_t (*nibble_read_data) (struct parport *port, void *buf,
 193                                     size_t len, int flags);
 194         size_t (*byte_read_data) (struct parport *port, void *buf,
 195                                   size_t len, int flags);
 196         struct module *owner;
 197 };
 198
 199 struct parport_device_info {
 200         parport_device_class class;
 201         const char *class_name;
 202         const char *mfr;
 203         const char *model;
 204         const char *cmdset;
 205         const char *description;
 206 };
 207
 208 /* Each device can have two callback functions:
 209  *  1) a preemption function, called by the resource manager to request
 210  *     that the driver relinquish control of the port.  The driver should
 211  *     return zero if it agrees to release the port, and nonzero if it
 212  *     refuses.  Do not call parport_release() - the kernel will do this
 213  *     implicitly.
 214  *
 215  *  2) a wake-up function, called by the resource manager to tell drivers
 216  *     that the port is available to be claimed.  If a driver wants to use
 217  *     the port, it should call parport_claim() here.
 218  */
 219
 220 /* A parallel port device */
 221 struct pardevice {
 222         const char *name;
 223         struct parport *port;
 224         int daisy;
 225         int (*preempt)(void *);
 226         void (*wakeup)(void *);
 227         void *private;
 228         void (*irq_func)(int, void *, struct pt_regs *);
 229         unsigned int flags;
 230         struct pardevice *next;
 231         struct pardevice *prev;
 232         struct parport_state *state;     /* saved status over preemption */
 233         wait_queue_head_t wait_q;
 234         unsigned long int time;
 235         unsigned long int timeslice;
 236         volatile long int timeout;
 237         unsigned long waiting;           /* long req'd for set_bit --RR */
 238         struct pardevice *waitprev;
 239         struct pardevice *waitnext;
 240         void * sysctl_table;
 241 };
 242
 243 /* IEEE1284 information */
 244
 245 /* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
 246  * PP[GS]ETPHASE, so do not change existing values. */
 247 enum ieee1284_phase {
 248         IEEE1284_PH_FWD_DATA,
 249         IEEE1284_PH_FWD_IDLE,
 250         IEEE1284_PH_TERMINATE,
 251         IEEE1284_PH_NEGOTIATION,
 252         IEEE1284_PH_HBUSY_DNA,
 253         IEEE1284_PH_REV_IDLE,
 254         IEEE1284_PH_HBUSY_DAVAIL,
 255         IEEE1284_PH_REV_DATA,
 256         IEEE1284_PH_ECP_SETUP,
 257         IEEE1284_PH_ECP_FWD_TO_REV,
 258         IEEE1284_PH_ECP_REV_TO_FWD,
 259         IEEE1284_PH_ECP_DIR_UNKNOWN,
 260 };
 261 struct ieee1284_info {
 262         int mode;
 263         volatile enum ieee1284_phase phase;
 264         struct semaphore irq;
 265 };
 266
 267 /* A parallel port */
 268 struct parport {
 269         unsigned long base;     /* base address */
 270         unsigned long base_hi;  /* base address (hi - ECR) */
 271         unsigned int size;      /* IO extent */
 272         const char *name;
 273         unsigned int modes;
 274         int irq;                /* interrupt (or -1 for none) */
 275         int dma;
 276         int muxport;            /* which muxport (if any) this is */
 277         int portnum;            /* which physical parallel port (not mux) */
 278
 279         struct parport *physport;
 280                                 /* If this is a non-default mux
 281                                    parport, i.e. we're a clone of a real
 282                                    physical port, this is a pointer to that
 283                                    port. The locking is only done in the
 284                                    real port.  For a clone port, the
 285                                    following structure members are
 286                                    meaningless: devices, cad, muxsel,
 287                                    waithead, waittail, flags, pdir,
 288                                    ieee1284, *_lock.
 289
 290                                    It this is a default mux parport, or
 291                                    there is no mux involved, this points to
 292                                    ourself. */
 293
 294         struct pardevice *devices;
 295         struct pardevice *cad;  /* port owner */
 296         int daisy;              /* currently selected daisy addr */
 297         int muxsel;             /* currently selected mux port */
 298
 299         struct pardevice *waithead;
 300         struct pardevice *waittail;
 301
 302         struct list_head list;
 303         unsigned int flags;
 304
 305         void *sysctl_table;
 306         struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */
 307         struct ieee1284_info ieee1284;
 308
 309         struct parport_operations *ops;
 310         void *private_data;     /* for lowlevel driver */
 311
 312         int number;             /* port index - the `n' in `parportn' */
 313         spinlock_t pardevice_lock;
 314         spinlock_t waitlist_lock;
 315         rwlock_t cad_lock;
 316
 317         int spintime;
 318         atomic_t ref_count;
 319
 320         struct list_head full_list;
 321         struct parport *slaves[3];
 322 };
 323
 324 #define DEFAULT_SPIN_TIME 500 /* us */
 325
 326 struct parport_driver {
 327         const char *name;
 328         void (*attach) (struct parport *);
 329         void (*detach) (struct parport *);
 330         struct list_head list;
 331 };
 332
 333 /* parport_register_port registers a new parallel port at the given
 334    address (if one does not already exist) and returns a pointer to it.
 335    This entails claiming the I/O region, IRQ and DMA.  NULL is returned
 336    if initialisation fails. */
 337 struct parport *parport_register_port(unsigned long base, int irq, int dma,
 338                                       struct parport_operations *ops);
 339
 340 /* Once a registered port is ready for high-level drivers to use, the
 341    low-level driver that registered it should announce it.  This will
 342    call the high-level drivers' attach() functions (after things like
 343    determining the IEEE 1284.3 topology of the port and collecting
 344    DeviceIDs). */
 345 void parport_announce_port (struct parport *port);
 346
 347 /* Unregister a port. */
 348 extern void parport_remove_port(struct parport *port);
 349
 350 /* Register a new high-level driver. */
 351 extern int parport_register_driver (struct parport_driver *);
 352
 353 /* Unregister a high-level driver. */
 354 extern void parport_unregister_driver (struct parport_driver *);
 355
 356 /* If parport_register_driver doesn't fit your needs, perhaps
 357  * parport_find_xxx does. */
 358 extern struct parport *parport_find_number (int);
 359 extern struct parport *parport_find_base (unsigned long);
 360
 361 /* Reference counting for ports. */
 362 extern struct parport *parport_get_port (struct parport *);
 363 extern void parport_put_port (struct parport *);
 364
 365 /* parport_register_device declares that a device is connected to a
 366    port, and tells the kernel all it needs to know.
 367    - pf is the preemption function (may be NULL for no callback)
 368    - kf is the wake-up function (may be NULL for no callback)
 369    - irq_func is the interrupt handler (may be NULL for no interrupts)
 370    - handle is a user pointer that gets handed to callback functions.  */
 371 struct pardevice *parport_register_device(struct parport *port,
 372                           const char *name,
 373                           int (*pf)(void *), void (*kf)(void *),
 374                           void (*irq_func)(int, void *, struct pt_regs *),
 375                           int flags, void *handle);
 376
 377 /* parport_unregister unlinks a device from the chain. */
 378 extern void parport_unregister_device(struct pardevice *dev);
 379
 380 /* parport_claim tries to gain ownership of the port for a particular
 381    driver.  This may fail (return non-zero) if another driver is busy.
 382    If this driver has registered an interrupt handler, it will be
 383    enabled.  */
 384 extern int parport_claim(struct pardevice *dev);
 385
 386 /* parport_claim_or_block is the same, but sleeps if the port cannot
 387    be claimed.  Return value is 1 if it slept, 0 normally and -errno
 388    on error.  */
 389 extern int parport_claim_or_block(struct pardevice *dev);
 390
 391 /* parport_release reverses a previous parport_claim.  This can never
 392    fail, though the effects are undefined (except that they are bad)
 393    if you didn't previously own the port.  Once you have released the
 394    port you should make sure that neither your code nor the hardware
 395    on the port tries to initiate any communication without first
 396    re-claiming the port.  If you mess with the port state (enabling
 397    ECP for example) you should clean up before releasing the port. */
 398
 399 extern void parport_release(struct pardevice *dev);
 400
 401 /**
 402  * parport_yield - relinquish a parallel port temporarily
 403  * @dev: a device on the parallel port
 404  *
 405  * This function relinquishes the port if it would be helpful to other
 406  * drivers to do so.  Afterwards it tries to reclaim the port using
 407  * parport_claim(), and the return value is the same as for
 408  * parport_claim().  If it fails, the port is left unclaimed and it is
 409  * the driver's responsibility to reclaim the port.
 410  *
 411  * The parport_yield() and parport_yield_blocking() functions are for
 412  * marking points in the driver at which other drivers may claim the
 413  * port and use their devices.  Yielding the port is similar to
 414  * releasing it and reclaiming it, but is more efficient because no
 415  * action is taken if there are no other devices needing the port.  In
 416  * fact, nothing is done even if there are other devices waiting but
 417  * the current device is still within its "timeslice".  The default
 418  * timeslice is half a second, but it can be adjusted via the /proc
 419  * interface.
 420  **/
 421 static __inline__ int parport_yield(struct pardevice *dev)
 422 {
 423         unsigned long int timeslip = (jiffies - dev->time);
 424         if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
 425                 return 0;
 426         parport_release(dev);
 427         return parport_claim(dev);
 428 }
 429
 430 /**
 431  * parport_yield_blocking - relinquish a parallel port temporarily
 432  * @dev: a device on the parallel port
 433  *
 434  * This function relinquishes the port if it would be helpful to other
 435  * drivers to do so.  Afterwards it tries to reclaim the port using
 436  * parport_claim_or_block(), and the return value is the same as for
 437  * parport_claim_or_block().
 438  **/
 439 static __inline__ int parport_yield_blocking(struct pardevice *dev)
 440 {
 441         unsigned long int timeslip = (jiffies - dev->time);
 442         if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
 443                 return 0;
 444         parport_release(dev);
 445         return parport_claim_or_block(dev);
 446 }
 447
 448 /* Flags used to identify what a device does. */
 449 #define PARPORT_DEV_TRAN                0       /* WARNING !! DEPRECATED !! */
 450 #define PARPORT_DEV_LURK                (1<<0)  /* WARNING !! DEPRECATED !! */
 451 #define PARPORT_DEV_EXCL                (1<<1)  /* Need exclusive access. */
 452
 453 #define PARPORT_FLAG_EXCL               (1<<1)  /* EXCL driver registered. */
 454
 455 /* IEEE1284 functions */
 456 extern void parport_ieee1284_interrupt (int, void *, struct pt_regs *);
 457 extern int parport_negotiate (struct parport *, int mode);
 458 extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
 459 extern ssize_t parport_read (struct parport *, void *buf, size_t len);
 460
 461 #define PARPORT_INACTIVITY_O_NONBLOCK 1
 462 extern long parport_set_timeout (struct pardevice *, long inactivity);
 463
 464 extern int parport_wait_event (struct parport *, long timeout);
 465 extern int parport_wait_peripheral (struct parport *port,
 466                                     unsigned char mask,
 467                                     unsigned char val);
 468 extern int parport_poll_peripheral (struct parport *port,
 469                                     unsigned char mask,
 470                                     unsigned char val,
 471                                     int usec);
 472
 473 /* For architectural drivers */
 474 extern size_t parport_ieee1284_write_compat (struct parport *,
 475                                              const void *, size_t, int);
 476 extern size_t parport_ieee1284_read_nibble (struct parport *,
 477                                             void *, size_t, int);
 478 extern size_t parport_ieee1284_read_byte (struct parport *,
 479                                           void *, size_t, int);
 480 extern size_t parport_ieee1284_ecp_read_data (struct parport *,
 481                                               void *, size_t, int);
 482 extern size_t parport_ieee1284_ecp_write_data (struct parport *,
 483                                                const void *, size_t, int);
 484 extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
 485                                                const void *, size_t, int);
 486 extern size_t parport_ieee1284_epp_write_data (struct parport *,
 487                                                const void *, size_t, int);
 488 extern size_t parport_ieee1284_epp_read_data (struct parport *,
 489                                               void *, size_t, int);
 490 extern size_t parport_ieee1284_epp_write_addr (struct parport *,
 491                                                const void *, size_t, int);
 492 extern size_t parport_ieee1284_epp_read_addr (struct parport *,
 493                                               void *, size_t, int);
 494
 495 /* IEEE1284.3 functions */
 496 extern int parport_daisy_init (struct parport *port);
 497 extern void parport_daisy_fini (struct parport *port);
 498 extern struct pardevice *parport_open (int devnum, const char *name,
 499                                        int (*pf) (void *),
 500                                        void (*kf) (void *),
 501                                        void (*irqf) (int, void *,
 502                                                      struct pt_regs *),
 503                                        int flags, void *handle);
 504 extern void parport_close (struct pardevice *dev);
 505 extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
 506 extern int parport_device_num (int parport, int mux, int daisy);
 507 extern void parport_daisy_deselect_all (struct parport *port);
 508 extern int parport_daisy_select (struct parport *port, int daisy, int mode);
 509
 510 /* Lowlevel drivers _can_ call this support function to handle irqs.  */
 511 static __inline__ void parport_generic_irq(int irq, struct parport *port,
 512                                            struct pt_regs *regs)
 513 {
 514         parport_ieee1284_interrupt (irq, port, regs);
 515         read_lock(&port->cad_lock);
 516         if (port->cad && port->cad->irq_func)
 517                 port->cad->irq_func(irq, port->cad->private, regs);
 518         read_unlock(&port->cad_lock);
 519 }
 520
 521 /* Prototypes from parport_procfs */
 522 extern int parport_proc_register(struct parport *pp);
 523 extern int parport_proc_unregister(struct parport *pp);
 524 extern int parport_device_proc_register(struct pardevice *device);
 525 extern int parport_device_proc_unregister(struct pardevice *device);
 526
 527 /* If PC hardware is the only type supported, we can optimise a bit.  */
 528 #if !defined(CONFIG_PARPORT_NOT_PC)
 529
 530 #include <linux/parport_pc.h>
 531 #define parport_write_data(p,x)            parport_pc_write_data(p,x)
 532 #define parport_read_data(p)               parport_pc_read_data(p)
 533 #define parport_write_control(p,x)         parport_pc_write_control(p,x)
 534 #define parport_read_control(p)            parport_pc_read_control(p)
 535 #define parport_frob_control(p,m,v)        parport_pc_frob_control(p,m,v)
 536 #define parport_read_status(p)             parport_pc_read_status(p)
 537 #define parport_enable_irq(p)              parport_pc_enable_irq(p)
 538 #define parport_disable_irq(p)             parport_pc_disable_irq(p)
 539 #define parport_data_forward(p)            parport_pc_data_forward(p)
 540 #define parport_data_reverse(p)            parport_pc_data_reverse(p)
 541
 542 #else  /*  !CONFIG_PARPORT_NOT_PC  */
 543
 544 /* Generic operations vector through the dispatch table. */
 545 #define parport_write_data(p,x)            (p)->ops->write_data(p,x)
 546 #define parport_read_data(p)               (p)->ops->read_data(p)
 547 #define parport_write_control(p,x)         (p)->ops->write_control(p,x)
 548 #define parport_read_control(p)            (p)->ops->read_control(p)
 549 #define parport_frob_control(p,m,v)        (p)->ops->frob_control(p,m,v)
 550 #define parport_read_status(p)             (p)->ops->read_status(p)
 551 #define parport_enable_irq(p)              (p)->ops->enable_irq(p)
 552 #define parport_disable_irq(p)             (p)->ops->disable_irq(p)
 553 #define parport_data_forward(p)            (p)->ops->data_forward(p)
 554 #define parport_data_reverse(p)            (p)->ops->data_reverse(p)
 555
 556 #endif /*  !CONFIG_PARPORT_NOT_PC  */
 557
 558 #endif /* __KERNEL__ */
 559 #endif /* _PARPORT_H_ */